;
. FMFRP 12-43
Professional Knowledge Gained
fromOperational Experiencein
Vietnam,1969, SpecialIssue,
Minesand Boobytraps
U.S. Marine Corps
PCN 140 124300 000
DEPARTMENT OF THE NAVY
Headquarters United States Marine Corps
Washington, DC 20380-0001
20July1989
FOREWORD
1. PURPOSE
Fleet Marine Force Reference Publication (FMFRP) 12-43, Professional
Knowledge Gained from Operational Experiencein Vietnam, 1969, Special
Issue, Mines and Boobytraps, is published to ensure the retention and dis-
semination of useful information which is not intended to become doctrine
or to be published in Fleet Marine Force manuals. FMFRPs in the 12 Series
are a special category of publications: reprints of historical works which
were published commercially or by the U.S. Government Printing Office
and are no longer in print.
2. SCOPE
This reference publication complements existing training manuals on small-
unit tactics, patrolling, weapons, mines and booby traps, and leadership.
Written by a multitude of Marines during the Vietnam War, this volume
is an excellent compendium of lessons to be learned from the Marine Corps’
experience in 1969. It is enthusiastically recommended to all junior offi-
cers, SNCOS, and NCOS who will profit from the principles presented.
3. CERTIFICATION
Reviewed and approved this date.
BY DIRECTION OF THE COMMANDANT OF THE MARINE CORPS
M. P. SULLIVAN
Major General, U.S. Marine Corps
Deputy Commander for Warfighting
Marine Corps Combat Development Command
Quantico, Virginia
DISTRIBUTION: /1”, [ (]/1
MAY-JUN 1969
MINES AND BOOBYTRAPS
CONTENTS
SECTION PAGE
I ENEMY MINE WARFARE
Introduction. . . . . . . . . . 1
Enemy Doctrine. . . . . . . . . 3
Enemy Sources of Supply . . . . 3
VC Mine Factories . . . . . . . 5
Enemy Tactics . . . . . . . . . 6
II COUNTERMEASURES
Nontactical Countermeasures. . 9
Tactical Countermeasures . . . 13
Individual Countermeasures . . 15
Immediate Action to Take
When and After an Explosive
Device is Tripped. . . . . . 22
Unit Training. . . . . . . . . 23
III ENEMY MINE INDICATORS
IV ENEMY MINES AND BOOBYTRAPS
Explosive Antipersonnel
Devices. . . . . . . . . . .39
Nonexplosive Boobytraps, . . . 48
Antitank and Vehicle Mines . . 56
Antihelicopter Mining. . . . . 66
1
SECTION I
ENEMY MINE WARFARE
INTRODUC1’ION
The history of mine and boobytrap war-
fare is almost as long as the history of
war itself, Although these devices were
once considered an unfair and cowardly
manner of fighting an enemy, nations con-
tinued to develop and employ mines and
boobytraps because they provided an effec-
tive and simple means of inflicting
casualties upon an enemy force.
During the war with France, 1946-1954,
the Viet Minh used improvised explosive
mines and boobytraps et’fectively against
the French forces. The VC/NVA have con-
tinued to improve upon these techniques
and are emplo,yin~ mines and boobytraps as
an effective weapons system against free
world military forces in SVN today. l’he
number of Marine casualties, perhaps
better than any other example, illustrates
how effective the enemy is with these
devices. Marines landed in force in SVN
during March ).965and during the first
months of fighting approximately 65-75
percent of all Marine casualties were
caused by mines and boobytraps. Much has
been learned about the enemy’s methods of
employing mines and boobytraps since March
1965, but despite this knowledge, Marines,
at an alarming rate, continue to become
casualties as a direct result of enemy
mines and boobytraps. During 1968, 37.7
percent of all Marine casualties were
caused by the accidental detonation of a
mine or boobytrap. In other words, more
than one of every three Marines killed or
1
— -—,
‘;;oundedin SVN becomes a casualty as the
result of a mine or boobytrap. Although
a Great many detection means, ranging from
:ntricate electronic devices to specially
trained clogs, have been developed, experi-
ence has shown that an alert Marine, aware
of’what to look for and where to look, is
the most effective detection device.
The information contained in this book
is intended to make each Marine aware of
the ways which the VC/NVA use mines and
boobytraps and to describe the means to
effectively protect onets self and unit
from these devices.
To aid in this
objective, mines and boobytraps frequently
used by the VC/NVA are identified and
described.
StUdy this issue;
the information in
it can Gave lives
fellow Flarinesr.
-- yours and your
iii
—-,—
******
ENEMY DOCTRINE
Although modified by past guerrilla war-
fare experience in Vietnam, VC/NVA mine
warfare doctrine continues to closely par-
allel that of the Chinese Communist Army.
Extensive deliberate minef’ields have not
been encountered in Vietnam. Rather, the
enemy employs mines singly or in clusters
to achieve his purposes.
In areas occupied and protected by free
world forces, the enemy employs mines to
delay and disrupt the use of roads and
paths and to cause the allies to divert
forces to guard and clear those routes. In
addition to the threat to military traffic
and lawful civilian movement, the free
world personnel and.equipment employed in
patrollin~ the roads and in detecting and
removj.n~ mines are prime targets,
In contested areas where friendly offen-
sive operations or patrol activities are
conducted, the enemy employs mines and
boobytraps to inflict casualties, delay
and channelize movement, and damage or
destroy equipment.
******
ENEMY SOURCES OF SUPPLY
The enemy uses a very limited number of
modern machine-produced mines. The major-
ity of enemy mines are handmade by the VC
using U.S. duds, discarded ammunition and
equipment, and materials thrown away by
U.S. forces as trash. Ninety percent of
all the material in enemy mines and booby-
traps is of U.S. origin (see fig.1). Of
all the explosive devices produced locally
in VC mine factories, 95 percent are anti-
personnel boobytraps.
3
— —
Figure 1.--Enemy equipment captured
by Marines on sweep operations in ICTZ.
Note US M-26 grenade in center of
picture. Oti]cr [;l’cnadesare locally
produced using C-ration cans.
All dud amrnunltiorlis a source of’enemy
supply . After airstrikes and artillery
and mortar missions, enemy salvage teams
make sweeps to collect duds. Lighter
ordnance is carried away to preparation
areas ; large bombs and pro~ectiles are
broken down and stripped on the spot. In
some cases the lar~er duds are rigged as
boobytraps where they have fallen. This
is especially true when the enemy feels
the strike or fire mission was a prepara-
tion for an infantry attack.
However, dud ammunition is not the only
source of enemy supply. Carelessly dis-
carded ordnance of all sizes and in any
quantity is collected by enemy salvage
teams . Mortar rounds, “rockets, LAAW’S,
4
-_,--
grenades, and small arms ammunition aban-
doned to lighten the load (or Improperly
secured and lost by fast-mcving Marines)
have value as the explosive element in
boobytraps. Even a single M16 round
ejected to clear a stoppage can be used
by the enemy.
Additionally, materials discarded as
trash and improperly destroyed such as
ration, ammunition, beer and soda cans,
batteries, waterproof packaging materials,
bandoleers, etc., provide the enemy a
valuable source of supply to support his
mine warfare operations. These items
have, on numerous instances, been employed
successfully against Marines and their
equipment. Thorough police of friendly
positions upon departure and complete
destruction of trash are n~andatory to deny
the enemy this source of supply.
*S****
VC MINE FACTORIES
Primitive VC mine factories are usually
located in the areas they supply. Great
care is taken in the camouflage and dis-
persal of these facilities, Usually con-
structed underground, effort is made to
disperse the workshops and storage through-
out a series of tunnels. These limit
destruction by working accidents or free
world force artillery, air and naval gun-
fire and protect against discovery. As
important as concealment of the mine
factory, is the mobility of its personnel
and equipment. Even while the mine factory
is being settled in one position, new
positions are being prepared for rapid
displacement . Rarely does a mine factory
5
remain in one place any longer than a few
weeks . There is no distinct pattern of
movement. Factories have been known to
return to previous positions even after
that position has been discovered and
destroyed by Marine forces.
NVA-trained engineers provide the
skilled nucleus for the enemy mine fac-
tories, but supervision and labor are
primarily VC. The typical output of a
local VC mine factory is about 135 mines
and explosive devices per month.
X%****
ENEMY TACTICS
ANTITANK AND ANTIVEHICULAR MINING
As we improve in our ability to detect
:nines, the enemy counters with new twists
~ucl]as increased use of’boobytraps
attached to a basic mine to create casu-
alties amon~ mine-clear:lnc personnel ;
l.arccrmines buried deeper with reduced
activation prezzure; and pressure electric
detonators with offset devices to explode
mines under vehicles. Command-detonating
mines are normally used in densely popu-
lated areas and pressure-type devices in
less populated sections. The heaviest
mining is along lines of communications
near fixed installations.
The enemy makes every effort to avoid
repeating practices which, when analyzed,
could indicate a pattern. Therefore, the
VC/NVA doctrine stresses where to use
mines, not how. Listed below are a few of
the kinds Of places where enemy antitank
and antivehicular mines may be found:
eRoad junctions and the areas in the
vicinity of the road near the junction,
6
-.4-
with all the mines set to detonate simul-
taneously.
G Bridges and the approaches 5 to 15
meters from the bridges.
G ld wheel and tread tracks in the
road, with care taken to duplicate the
track after mine emplacement.
QUnderneath roads, tunneling in f’rom
the shoulders.
.Potholes in the road.
G Areas recently cleared by free world
military forces. The enemy replaces the
mines that have been taken out.
ANTIPERSONNEL MINES AND BOOBYTRAPS
Enemy tactics in emplacing antiperson-
nel mines and boobytraps differ from those
used in antitank and antivehicular mining
only by where they put them. Locations
most commonly used by the VC/NVA to emplace
antipersonnel mines and bOObYtI’apS are:
.Narrow passages.
.Pacldy dilces.
.Trail junctions,
.Hedgerows and tree lines.
G Tunnels and caves.
G Fence lines and gates.
G Tree branches overhanging trails.
.Likely CP sites.
.High ground and ridgelines.
.Shady areas.
G Stream fords.
G Wells and natural watering points
on streams and rivers.
G Likely helicopter landing Zones.
*
Remember: Any place a Marine frequently
walks, takes cover, rests, or draws water
is a likely location for enemy antiperson-
nel mines and boobytraps.
7
------
SECTION II
COUNTERMEASURES
Countermeasures are those actions, both
tactical and nontactical, that can be
taken by units and/or individual Marines
which reduce the mine and boobytrap threat.
Countermeasures decrease the enemy’s
ability to emplace mines and boobytraps
or limit their effectiveness if they are
emplaced.
NONTACTICAL COUNTERMEASURES
The most effective way to counter the
enemy’s mine and boobytrap threat is to
destroy this threat at its source; i.e.,
the elimination of the VC/NVA mine and
boobytrap factories and the sources of
supply for these factories.
Every effort must be made to locate
existing enemy mine and boobytrap factories
and to determine likely locations for
future factory sites. Hoi Chanhs, POW’s
and captured documents must be carefully
processed because, with skillful handling,
they provide vital information on factory
location sites. Once found, existing
factories and future locations must be
made unusable.
More important than neutralizing the
enemy’s mine and boobytrap factories, is
the denial to the enemy of the source of
supply with which he operates these fac-
tories; i.e., unexploded U.S. ordnance,
discarded equipment and improperly destroyed
trash. The fact that U.S. ordnance and
salvageable trash falls into enemy hands
can be traced to several factors :
9
-. .- .
D Unexploded
Ordnance
The first factor and an important source
of unexploded ordnance for the enemy is
provided by the free world military force’s
employment of air, artillery and naval gun-
fire support. Some ordnance items fail to
detonate, become a “dud” and provide a
potential mine or boobytrap. All Marines
who employ fire support should consider
this fact in the employment of supporting
arms, and be careful not to call for fires
in excess of what is required to accom-
plish the mission.
o
Abandoned Munitions
The second factor, another important
source of explosive materiel supply for the
enemy’s mine and boobytrap operations, is
abandoned or lost munitions . T’hefollowing
examples, if allowed to occur, will assist
the enemy In lII:GcfforLc:
G Ovcrstocka~.
—.
A unlljoverstocks ammu-
nition and tl]cn 1s rcqulred to move on
short notice with only a basic load. The
remaining amrnuni.tion1s left on the aban-
doned position.
eAmmunition Handling Procedures. A
unit attempts to turn in excess ammunition
to an ASP (ammunition supply point) and is
refused due to inefficient disposal pro-
cedures .
@Abuse of Ammunition. A unit discards
ammunition considered unserviceable because
of dirt, tarnish, mud or other avoidable
conditions or minor imperfections.
OLOSS in Transit. A helicopter sling
breaks on an ammunition resupply mission and
all or a portion of the load is scattered
across the countryside.
10
--- --
Q
Improperly Destroyed Trash
The last factor, but far from least
important to the enemy!s mine and booby-
trap Program, is his source of’supply from
friendly trash. All items considered
unusable by free world forces must be com-
pletely destroyed or properly disposed of.
Figure 2 shows one example of the results
of an improperly policed friendly area of
operations . Discarded C-ration/soda cans
are also commonly used in a type of booby-
trap which is constructed with an M26
grenade. The safety pin is removed and
the grenade is put in the can. When the
can is disturbed, the grenade slips out,
the spoon pops and the grenade detonates.
Figure 2.--Shown is a VC grenade made
from locally available materials inc-
luding a carelessly discarded “Coke”
can.
11
******
The VIP (Volunteer Informant Program)
has proved to be an increasingly effective
countermeasure to the enemy’s mine and
boobytrap efforts. This program rewards
Vietnamese individuals who turn in dud
and abandoned munitions. Continued empha–
sis on this program will significantly
decrease the enemy capacity to employ U.S.
ordnance against free world forces.
(See
fig. 3.) During one period, 188 of 259
payments in the III MAF area were made to
children who turned in explosives suitable
for the manufacture of boobytraps.
To en-
sure that the effectiveness of VIP reaches
its full potential, it is the responsibility
of every individual Marine and each Marine
unit to give VIP their complete support.
Figure 3. --Shown
here is the VIP
(Volunteer Informant Program) in action,
Articles on ground have been turned in
to Marines by local villagers.
12
-----
TACTICAL COUNTERMEASURES
Tactical countermeasures employed by
Marine units are very effective in reduc-
ing the enemy’s capability of emplacing
mines or boobytraps if such countermeasures
are aggressively planned and executed. Unit
commanders have several tactical measures
at their disposal, including the employment
of sophisticated electronic devices. They
are :
G Employing portable ground radar and
seismic intrusion devices.
. Maintaining a constant physical pres-
ence throughout the TAOR to include out-
posting of key roads. This is the most.
effective tactical countermeasure, but
sometimes difficult to achieve because of
the number of Marines required to ensure
good coverage.
.Conducting aggressive patrolling.
G Conducting reconnaissance patrols to
verify S-2 intelligence reports.
G Employing scout-sniper teams.
.Conducting small unit cordon and
search operations in coordination with
Vietnamese units/police.
.Employing H&I fires over roads or
over specific areas.
G Employing small stay-behind patrols
dropped off unnoticed from units passing
near a road.
G Paving or oiling dirt roads.
.Patrolling and outposting on and
near roads.
.Employing Kit Carson Scouts.
Using
the native ability of the Kit Carson Scouts,
coupled with their knowledge of the area
of operations and VC activities, can prove
highly useful in locating devices.
During
13
October 1968, Kit Carson Scouts found 229
mines and boobytraps in the III MAF area.
G Scout Dogs. Using specially trained
dogs (see fig. 4.) to detect the scent left
by the individual emplacing a mine or
boobytrap. This scent is detectable 1-4
days after emplacement. Since boobytraps
are generally emplaced shortly after initi-
ation of friendiy operations, the chance
of discovery by dogs is good. A trained
dog will use his vision to detect tripwires
and unnatural elements, and his hearing to
detect sound waves created by tripwire
vibration. Many dogs detect a tripwire
when it touches the body hair of their
forelegs or chest. Most are agile enough
to back away before it is tripped. of 119
dogs killed in SVN since January 196’7,
only seven were killed by boobytraps.
Figure 4.--Specially trained dogs
such as the one shown here have proven
extremely valuable in detecting enemy
mines and boobytraps.
14
INDIVIDUAL COUNTERMEASURES
Individual countermeasures are those
measures each and every Marine can take to
diminish the effectiveness of a mine or
boobytrap device which has been emplaced,
and is found or is accidentally detonated.
This can”be accomplished through physical
protective measures, detection and destruc-
tion measures, avoidance of explosive
devices, and through application of immedi-
ate action when an explosive device has
been accidentally detonated.
D
Physical Protective Countermeasures
The individual Marine can take these
steps to reduce the effectiveness of enemy
mines :
G Wear body armor and helmet.
.Sandbag vehicle flooring. When possi-
ble, place a heavy rubber mat over sandbags
to reduce secondary fragments such as
shrapnel, sand, stones and pieces of sand-
bag. .Keep
arms and legs inside vehicles to
achieve maximum protection from sandbags.
G Maintain proper distance from other
personnel.
G Don’t travel alone,
.Donlt pick up or touch what appear to
be attractive “souvenirs”. The VC/NVA prey
upon the natural curiosity of Marines and
heir desire to take home a souvenir.
b
Beware : That “souvenir” is most likely
—..
a boobytrap.
o
Detection Countermeasures
Once emplaced, a mine or boobytrap must
be found before it causes multiple casu-
alties through accidental detonation by
15
a Marine. Unfortunately, too many booby-
traps are discovered only after they
~~.nlode .
It is imperative that detection
techniques be stressed. Detection may be
by :
@V~~ual ~n~pection,
At present, the
best mine and boobytrap detector in the
Marine Corps is an alert and observant
Marine . Each Marine must know the areas
in which boobytraps and mines are normally
found and be alert for things which “just
don’t look right.” Examples are:
eMud smears, muclballs, clung, or a
board on the road.
eApparent road repair, ilewfill or
pavin(j patches, ditching or culvert work,
oWires leadinG away from the side of
the road.
el~ripwires across the trails; along
shoulders of roads at likely ambush sites;
across the most accessible route through
dense vegetation; at fords, ditches and
acrosc rice paddy dikes.
o’l?errainfeatures which do not appear
natural. Cut vegetation dries and changes
color; rain may wash away covering material
and cause an explosive device to sink
leaving a surface depression; a covered
device may appear as a mound.
eSuspicious items in trees, branches,
or bustles.
eMarkings used by VC/NVA to indicate
the location of a mine or boobytrap.
B probing,
Suspicious spots must be care-
fully probed with a probe or bayonet.
OMine detectors. Mine detectors are
(le~j.~nedto assist the individual Marine
in a detailed, deliberate sweep of a spe-
cific area, usually a road. Particular
16
attention must be given to the time factors
of the individual sweeping situatjon, s+rice
overhasty opening of a road can mean an
ineffective sweep and quite possibly
destruction or injury to vehicular traffic
and personnel. The average sweep rate
varies from almost nothing to about 5 m.p.h.
depending, of course, on the proficiency
of the team and the number of contacts
encountered. In using detectors, certain
considerations must be kept in mind:
.Graveled roads make it difficult for
the AN/PRS-4 detector to discriminate
between real and false targets,
.Metallic debris, such as can tops,
small arms ammunition cases, and metal
fragments from artillery rounds fired over
roads at night to discourage mine laying,
make it difficult for the AN/P153 deteotor
to discriminate between real and false
targets.
G The tendency for the enemy to bury
mines deeper than designed detection depths,
and to deliberately plant metallic debris
in the road, calls for additional caution
In the use of detectors.
.Operator fatigue. Consideration must
be given to the fatigue experienced by
operators after 20 minutes of wearing
detector earphones. This condition can be
delayed to 1 or 2 hours by wearing earphones
over the helmet so that 2 to 4 inches exist
between ear and phone, This also permits
the operator to hear a verbal alert for
an ambush.
G Use of the Buddy System. This system
is not only useful in training inexperi-
enced Marines, but also provides an extra
margin of safety to the individuals who
employ it. Two Marines working together,
in the same area, have the advantage of
17
increased detection capability. mutual
reassurance , and shared knowledge.
o
Destruction Countermeasures
Once detected, mines and boobytraps
must be marked and/or destroyed in place
by the discovering person or unit to pre-
vent accidental detonation by a following
unit or individual Marine. Considerations
for destruction are:
G Mines and boobytraps should not be
moved unless absolutely necessary and then
only by qualified EOD or engineer person-
nel. Many boobytraps are themselves booby-
trapped, and if disturbed will detonate the
associated device.
explosive devices should be destroyed
by engineers. If en~ineers are not avail-
able , then devices may be destroyed by
se].ected qualified personrlel wit,hl.neach
urlit.
eMincs and boobytraps may be destroyed
or neutralized by uue of Erappling hooks,
demolitions , and (artillery f’ires. The LVTE
lincchar~e and the LV’1’11 with plow-shaped
mine excavator (figs.
5 and 6) should be con-
sidered for use in areas of high ]tline
density.
o
Avoidance Countermeasures
Strict application of training and care-
ful planning of movements through danger
areas will enable unit commanders and indi-
viduals to reduce casualties by simply
avoiding the explosive devices.
The unit
leader must analyze from the enemy’s view-
point each area through which he intends
to move his men. He must ask himself the
question, “If I were the enemy, where would
I put the boobytrap?” This question can
and.should influence both administrative
18
,,
Figure 5.--’l’he .LV’1’E firi!lg lts organic
linecharge to clear mines.
Figure 6.--The LVTE with its plow-shaped
mine excavator.
19
and tactical movements and is a factor to
be considered in the scheme of maneuver
during an attack. Some suggested means
for avoiding mines and boobytraps are:
G Stay off trails, footpaths, cart
tracks , or other likely routes of travel
as much as possible. Vary routes used to
villages and key terrain features. Use of
the same route twice is an invitation to
the enemy to employ boobytraps. Keep the
VC/NVA guessing as to which route will be
used next.
.Move where local inhabitants move.
‘1’he:epeople know the location of most
Inines and boobytraps and will avoid these
areas . In a village, stay near the vil-
agers and watch which buildings they use.
Use Vietnamese as guides whenever possible.
Have sufficient money on hand to pay for
information on mine and boobytrap locations
and ,support VIP.
G Avoiclpatterns . Constantly change
direction of movement. Check times of
departure and return of patrols to ensure,
for example, khat all daylight patrols
don’t return before supper and all nightt-
ime patrols depart after supper. Avoid
tilerepeated use of the same bivouac areas.
.Maintain intervals of 15 meters be-
tween men and 100 meters between men and
tracked vehicles. In view of the fact
that the effective casualty radius of the
M26 grenade is 15 meters, and that two or
more casualties are suffered for each
boobytrap grenade accidently detonated,
the maintenance of proper interval is most
important.
.Move slowly. Rapid movement generates
carelessness. A unit must be allowed suf-
ficient time to move to its objective.
G At times the enemy will show themselves
only when they want to be seen. When
20
—
pursuing the enemy, be especially alert
for deliberately emplaced boobytraps on
the axis of advance.
G Artillery and mortar fires near and
in the area of operations will not only
discourage boobytrap emplacement, but will
also neutralize devices by sympathetic
detonation, overturning and burying em-
placed mines, and rupturing tripwires.
Employment of these fires beside a road,
before and during a road sweep, will dis-
courage command detonation of road mines.
.At all times,
a lightweight stick
(bamboo) or a slender steel rod can be
helpful if used to feel for tripwires.
.Mark detected mines and boobytraps
so those following may avoid them.
.Helicopters can be used to extract a
unit which finds itself in a heavily booby-
trapped area.
G At times,
the flanks of a road are
boobytrapped out to 250 meters as an
obstacle to road sweep security teams.
Tanks , preceding the infantry, can detonate
these boobytraps. When trafficability
permits, tanks moving off and parallel to
the road sweeps can also reduce tank road-
mining incidents. Random selection of tank
travel between road and adjacent terrain
will keep the NVA guessing as to the actual
route the tank will take.
.When on roads,
stay in the well-used
portion and off shoulders.
GFO11OW the tracks of the vehicle ahead,
If there is no vehicle ahead, stay out of
the ruts.
G Avoid holes, depressions, and objects
lying on the road.
+
Remember: A boobytrap too easily
detected can be a ruse resulting in detona-
tion of other explosive devices emplaced
nearby.
21
*****%
Immediate Action To Take When and After
an Explosive Device Is Tripped
It is recognized that little reaction
time exists once the detonation chain
starts. The maximum delay for the M26 and
foreign grenades ranges from 4 to 9 seconds.
If the delay element has been modified, the
minimum fuse delay can be less than 1 1/2
seconds . However, since the time available
cannot be predicted, certain immediate
action can assist in reducing casualties
and the degree of personal injury.
b Immediate
Action
FIRST: Be alert for the “pop” of the
exploding cap, the tug of the
tripwire, or the warning of
another Marine.
‘J) FIIRII : Drop to Lhe ground immediately.
Immediate act:Lon is designed as an instinc-
tive reaction based on minimum fuse delay.
h’henusing it also remember:
.Do not attempt to outrun the explosion,
The 800 fragments of the M26 grenade have
an initial velocity of over 5000 feet per
second. During the available delay, how-
ever brief, an individual can best remove
himself from the cone of the explosion by
dropping to the ground. He must assume
a minimum delay in every case.
eIf possible, when dropping to the
ground, present the smallest target to the
force of the explosion by pointing the
feet in the direction of the charge.
.All those nearby should drop to the
ground when the warning is sounded.
22
G DO not immediately rush to the aid
of Marines wounded by mines or boobytraps.
Frequently there is a second boobytrap in
the vicinity of the first. The man near-
est each casualty should carefully clear
his way to the wounded individual and
render first aid. Under no circumstances
should the unit leaders or others crowd
near the wounded men.
.Conduct a brief but careful search
for other explosive devices in the imme-
diate vicinity before moving on.
.If a device is tripped and does not
explode, follow the same immediate action
and then blow it in place.
******
UNIT TRAINING
We have discussed preventive counter-
measures , tactical countermeasures and
individual countermeasures. Simply real-
izinflthat these countermeasures exist
lSII’t ~ufric:icnb, IIL.L:+:Imperablve that
every Marine becomes knowledgeable of and
proficient in the execution Or the counter-
measures discussed. ‘fhis task can be
accomplished through an aggressive and
comprehensive unit and individual training
program. Such training should emphasize:
G Wearing of helmets and body armor.
G Dispersion between men.
. Alertness .
QVisual detection techniques?
operation of electronic detection
equipment.
.Demolition training which enables
Marines to destroy explosive devices in
place.
.Employment of the buddy system.
.Avoidance of patterns .
.Immediate action procedures and action
to take subsequent to the detonation of an
explosive device.
23
— .-
SECTION III
ENEMY MINE INDICATORS
If the enemy emplaces mines or booby-
traps in the vicinity of villages or in
areas where he moves or expects to move,
he often indicates the location or direc-
tion of the explosive devices in some
manner. The VC/NVA may not always follow
the examples in this publication in abso-
lute detail, but as a general rule, the
indicators are usually found in a regular
pattern such as sticks or stones in a line
or sticks placed on or in the ground. This
regularity of pattern is the danger signal
(see fig. 7). Any arrangement of sticks
and stones which appears unnatural indicates
a strong possibility of the presence of
mines and boobytraps. The illustrations
which follow are examples of marking pat-
terns indicating the presence of mines
and boobytraps which have been encountered
thus far in SVN.
ARROW MARKERS
\
‘.
A
A. Three ~ticks are placed on the trail in
the form of an arrowhead. The important
thing to remember is that the point of the
arrow does not always point in the direction
of’the boobytrap. The symbol can only be
considered as a means to identify an area
as being boobytrapped,
B. A variation of the three-stick arrowhead
shows a fourth stick, Again, no definite
pattern has been established as to direction
or the reason for the fourth stick (usually
I)rokerl). But it does mean boobytraps
in
the area.
c. The “Y” arrangement is sometime5 found
farther down the trail from the arrowhead
indicating the limit of the danger area.
No pattern or specific distance has been
established.
26
— ..-
BAMBOO RECTANGLE MARKER
As shown, this marker usually indicates
a boobytrap within the square.
Most of
these symbols found l]avebeen laid out
w II,lJ bamboo 18 to 42 incl~es in length.
IJAM1300MARKER
A piece of bamboo 6 to 8 inches long is
stuck in the ground at an angle of 45
degrees. Generally, boobytraps can be
expected along the axis of the bamboo in
either direction.
27
BAMBOO TRIPOD MARKER
The bamboo tripod consists of bamboo,
usually about 18 inches long, tied to-
gether to form a tripod. Wire, vines ,
cord or string is wrapped around the legs
near the bottom to hold the tripod in
place. This device has been found directly
over punji pits, boobytraps, and mines.
28
— -- --
BROKEN BUSH OR STICK MARKERS
A. The enemy has been known to break the
tops of small saplings and bushes pointing
the broken part in the direction of the
boobytrapped area.
Usually mines and
boobytraps are planted 50 to 100 meters
from this marker.
B. A stick or length of bamboo broken at
a right angle and lying across the road or
trail may mean an enemy mine or boobytrap
200 to 400 meters ahead.
29
BANANA LEAF MARKERS
A banana leaf or other similar leaf is
folded down the center with a thin stick
approximately the thickness of a toothpick
woven through in two places. In addition
to marking mines, this may indicate an
ambush area. There is no pattern as to
location or distance of mines or ambushes
from this marker.
iii
-.
..
PARALLEL STICK MARKER
Short sticks or lengths of bamboo laid
parallel to a road or trail usually mean
the road or trail is free of mines or
boobytraps.
30
C*
. z
GROWING GRASS MARKER
Il!I
Growing grass is sometimes tied to
f’ormfour growing sheaves of grass. The
tied sheaves form a square of about 6 feet.
The mine is buried or concealed in the
center of the square.
@
)
31
TRAIL MARKERs
These devices have been used extensively
together. The mine or boobytrap Is placed
(buried) under two large leaves. In front
and to the rear,
at no special distance,
stakes are driven.
The markers have also
been used independently of each other at
times.
C*
32
FORKED-STICK MARKER
A forked stick Is driven vertically
Into the ground and another stick is laid
into the fork with the elevated end point-
ing to the danger area, Distance to
explosive device is unknown.
This sign
may also indicate enemy direction of
movement.
@
33
ROCK MARKERS
Various formations of rocks and small
stones are used to mark boobytrapped areas.
No pattern of distance or location has
been established.
‘>.$
fii ,.
34
SPACED-STICK MARKER
#--’
Three sticks, one on each side of a
road or trail and one in the middle,
usually mean the road 1s not to be used.
A mine or boobytrap is usually 200 to
400 meters from the marker. Stones have
been used in the same manner.
35
i!ii$$
1,
TRACK MARKER
I&TCCCEE[
Iccgccc[
*
The enemy has capitalized on our habit
of following old vehicle tracks by placing
mines in these tracks.
Mines are some-
times marked with crossed sticks or an
arrangement of stones. The location of
the mine in relation to these markers is
unknown. The mine may be under the
marker or up to 400 meters farther on.
‘ii
36
STAKES WITH X-MARKER
An MIA1 antitank mine with approximately
25 pounds of TNT was discovered under this
marker. The mine had been marked with
stakes at each corner and three sticks
forming an ‘lx1lover the mine.
@
37
-..__ _,
-T ---
SECTION IV
ENEMY MINES AND BOOBYTRAPS
EXPLOSIVE ANTIPERSONNEL DEVICES
Mines and explosive boobytraps employed
by the enemy against friendly personnel
are limited in type and quantity only by
the availability of explosive materials
and the imagination of the enemy. Any-
thing that can be made to explode and
cause injury can be rigged as an anti-
personnel mine or boobytrap.
Antipersonnel mines and explosive
boobytraps are very successfully employed
by khe VC/NVA. Part of this success is
because Marines are not familiar with the
physical description of explosive devices
normally employed by the VC/NVA, and thus
fall to recognize them prior to accidental
detonation.
The following illustrations represent
some of the devices employed by the
VC/NVA in SVN.
39
--..,
iii r.
SUN-BAKED
APPROX ~“
SAFETY PIN
REMOVED
MUDBALL MINE
MUD OR CLAY
THICK
\
M26 HAN DGRENADE
The mudball mine consists of a hand-
grenade encased in sun-baked mud or clay.
The safety pin (pull ring) is removed
and mud is molded around the grenade.
After the mud dries It holds the lever
of the grenade in the safe position.
The
mudball is placed on trails or anywhere
troops may walk. Stepping on the ball
breaks the dried mud apart and releases
the lever detonating the grenade.
The
U.S. M26 and M33 handgrenades have been
the most commonly used grenades for this
purpose although other lever-type grenades
may be used.
40
. .- .- -
TIN CAN ANTIPERSONNEL MINE
The tin can mine is constructed from
sheet metal or any discarded metal con-
tainer (C-ration, beer, or soft drink
can) . The firing device for the explosive
is an improvised fuse with zero delay
action. A handgrenade fuse may be used
by removal of the delay element. The mine
functions by a tripwire attached to the
pull ring. Pressure on the tripwire pulls
the pull ring, activating the mine in the
same manner as a handgrenade.
41
.-..
iii .
CAST-IRON ANTIPERSONNEL
FRAGMENTATION MINE
1- . I
fXST IRON lAWfDWOOD
I
J
. . . .
1. 31
This mine, made of cast iron, reserllblcs
a stick handgrenade with a very short
handle . The word “MIN” is often found
cast into the body.
The handle houses a
pull-friction igniter.
A tug on a trip-
wire attached to the friction igniter
will activate the fuse.
42
----- .
iiii
CHINESE COMMUNIST NO. 8
DUAL-PURPOSE MINE
4 Almost identical to the CHICOM No.
Dual-Purpose Mine, this device also has a
double-acting fu9e. Like the No.4, a
pressure of 300 pounds on the pressure
spider or a pull of 10 pounds on an attached
tripwire will detonate the mine. Slightly
larger than the No.4, this mine contains 5
pounds of explosive and has an overall
weight of 12 pounds. It is made of metal
and coated with creosote for waterproofing.
43
. .. .
BOUNDING FRAGMENTATION MINE
if
HANDGRENADE
LEADS TO
WOOD CYLINDER
ELECTRIC
DETONATOR
‘Iihebounding mine is improvised from
expended U.S. M2 bounding mine or M48 trip-
flare cases. A wooden cylinder slightly
smaller in diameter than the mine case is
hollowed out so that a standard grenade
can fit inside. The wooden cylinder (with
enclosed grenade) i.sthen fitted into the
mine case and the grenade’s safety pin is
extracted. When the mine is detonated,
the cylinder and grenade are propelled
upward.
As the wooden cylinder and grenade
separate, the handle flies off the grenade,
activating the fuse.
..
VC “TOE POPPER” MINE
This mine is fabricated of cartridge
cases or pieces of pipe of various sizes.
It is loaded with a charge of black
powder, a primer, and a variety of frag-
ments for missile effect. When the victim
steps on the mine, the igniter detonates
the black powder charge and propels the
fragments upward.
45
-.
CARTRIDGE TRAP
CARTRIDGE TRAP
\
CAMOUFLAGED BAMBOO SLAT
NAIL OR FIRING PIN (
WOODEN OOARD---
Four simple and easily obtainable
components make up this mine; a bamboo
tube, a nail, a piece of wood, and any
small arms ammunition or M79 round.
The
piece of wood is used as a base. The
bamboo tube is placed upright on the
wooden base and a nail is driven up through
the wood to penetrate the bottom of the
bamboo . The cartridge is then wedged into
the bamboo so that the primer is touching
the point of the nail. Partially buried
along a trail or path, the pressure of a
man’s foot stepping on the nose of the
cartridge forces the primer onto the nail,
firing the cartridge,
46
iii
DIRECTIONAL FRAGMENTATION
MINE (DH-1O)
% !f!Lg!l *
Commonly referred to as a “CHICOM or
VC claymore,” this mine has characteristics
similar to the U.S. M18 Claymore Mine.
Fused electrically, it is a command-deto-
nating device designed for employment from
ambush or defensive positions.
It has a
range of 150 to 200 meters and is effective
against personnel and thin-skinned vehicles.
47
)
iii
1.
POMZ-2 ANTIPERSONNEL MINE
BODY
PULL WIRE
\
INSIDE HERE
1
4
Chinese Communist copies of the Soviet
POMZ-2 mine are now being employed by the
VC/NVA . Weighing only 4.4 pounds, it is
e~sily carried and can be emplaced quickly.
Fused for detonation by tripwire (tension
release or pressure release), it can also
be rigged electrically for command deto-
nation.
******
NONEXPLOSIVE BOOBYTRAPS
The idea of nonexplosive boobytraps is
as old as man. From the simple earth pit
lined with sharpened stakes to highly
sophisticated mechanisms of triggered coils
and latches, the enemy employs them all.
The principle employed is simply to use
anything that will catch the victim by
surprise.
48
BARBED-SPIKE PLATE
BARBED–SPIKE PLATE
The barbed-spike plate is the basic
element of all enemy nonexplosive booby-
traps. The plate,
a flat piece of’wood
or metal, is used as a base to fasten
any number of barbed spikes.
The spikes,
ranging in length from several inches to
several feet,
are fastened securely to
the base. When a man steps or falls on
the spiked plate,
or’is struck by one, the
spikes will penetrate, producing a
serious wound.
49
—
SPIKE TRAP BOX
TOP \
k–-––– 40C-----4
‘i’ili:~ device i~ a simple wooden box
made of boards joined together with four
corner posts . The box has a lightweight top
but the bottom is removed.
Barbed spikes
are placed in the ground at tl~ebottom
pointing upward. This trap is usually
set up on dirt roads and trails to take
advantage of favorable camouflage.
50
--.— . .
POINTED BAMBOO STAKES
Made of bamboo which has been sharpened,
the stakes are stuck In the ground and
covered withl grass.
When a weapon is fired
or a grenade thrown, ‘troops seek cover and
are impaled.
C*
51
.—, -
SPIKE ‘1’RAppIrr
SPIKE TRAP PIT
.3-
‘~- ii, q ~
NJiii CHtiNG
a&Q5&,,7,
~CROSSBEAM LOC~
7NANH NGANG GIIJ
,J$J4=#ox?:;,
h, ,~
A trap pit is a large trap box with a
bamboo top. Stakes are made of sharpened
bamboo or barbed spikes and used to line
the box. When a man steps on the trap he
will fall into the pit,
The top turns on
an axle; thererore, the trap does not need
to be reset to work again.
The pit is
often prepared as a defensive obstacle and
then made safe by locking it in place with
a crossbeam (so it can be crossed safely
by the enemy) until the desired time of
l..ls~.
52
— —.
iii%
TRAP BRIDGE
.——
TRAP BRIDGE
CUT AT THE MIDDLE ANO COVERED WITH MUD
‘\
A small footbridge i.spartially cut in
the middle, ‘l’hecut is then camouflaged
wittlcoverings of’mud, etc. Barbed spikes
or sharpened bamboo stakes are emplaced
under the cut, using the water, mud or
foilage under the bridge as camouflage.
The weight of a man on the bridge will
cause it to collapse, tumbling the victim
onto the spikes. Like the spike trap pit,
bridges can be prepared in this manner,
then braced for normal use, At the
approach of free world forces the braces
are removed.
53
___ _
a
STEEL ARROW TRAP
STEEL ARROW TRAP
OAMBOO
TRIPWIRE CROSSES
THE ROAD
This trap utilizes a bamboo tube
(usually about 3 feet long) as a launcher.
A steel arrow is placed in the tube.
Using a block of wood as the bolt, a strip
of strong rubber for power and a catch to
lock the rubber strip, the device is fired
Twith a tripwire.
When the victim tri~s
the wire, the latch disengages, allowing
the rubber strip to launch the arrow.
54
BAMBOO WHIP
A strip of springy bamboo from 3 to 10
feet in length is used to make a bamboo
whip. A barbed-spike plate is secured to
the tip of the bamboo (or several of the
spikes driven through the bamboo), and the
whip is drawn back and secured. A tripwire
is then latched to the whip and the wire is
strung across the trail. When a man trips
the wire, the bamboo is released, and whips
around, striking the victim with the spikes.
55
. . . _
ANTITANK AND VEHICLE MINES
Mines employed by the enemy against
wheeled and tracked vehicles vary from
conventional antitank mines of foreign
manufacture to rigged duds and locally
produced explosive devices. All the in-
dustrially produced mines are of the type
fused for detonation at from 150 to 400
pounds of pressure. They are buried
slightly beneath the surface of the ground.
The enemy generally employs these mines as
designed but has varied fusing and posi-
tioning so that there is no definite pattern.
******
SOVIET ANTITANK MINE TMB-2
Designed to avoid detection by a mine
detector, this mine is constructed of black
or brown tar-impregnated cardboard! It iS
gauged for activation by a force of 350
56
—.- -
pounds of pressure. Further,
it can be
waterproofed by use of wood and plastic
sheeting, without losing its nondetection
characteristic .
It contains 11 pounds of
explosive and has an overall weight of
15.4 pounds.
ii!?
-.
CHINESE COMMUNIST NO. 4
DUAL-PURPOSE MINE
Intended for employment against both
vehicles and personnel, this mine incor-
porates a double-acting fuse that will
detonate the mine under either of two
circumstances : The first, when a load of
300 pounds of pressure is applied to the
pressure spider; the second, when a pull
of 10 pounds is exerted on a tripwire
fastened to the fuse’s striker-retainer
pin. Constructed of creosoted metal, it
carries 4 pounds of explosive and has an
overall weight of about 10 pounds.
57
-—
CONCRETE I?RAGMENTATION MINE
—
.i . . ..-
-4
coo
.—
...
This mine is constructed of explosive
encased in a cylindrically shaped concrete
shell with a flat side for stable emplace-
ment . A 2-inch-diameter pipe on one end
of the mine serves as a carrying handle
and detonator housing. The two swivels on
top of the mine are used to tie it to an
object. Usually employed as a command-
detonating mine, it is equipped with an
electrical firing device.
58
—-. .
C*
NVA CAST-IRON FRAGMENTATION
ANTITANK MINE
Produced in North Vietnam, this egg-
shaped mine is made of cast iron with
serrations on its outer surface. Designed
for command detonation, the mine is fused
with an electrical detonator and weighs
12 pounds.
59
‘%-
(3
>f-
.!.
VC MOUND-SHAPED MINE
/
CAR9VWGmE
--l
-@cl
DET0NAT08 LEAD
Ill lING ,“E
Manufactured locally in VC mine fac-
tories, this mine contains an iron-pipe
detonator encased in concrete.
Another
command-detonating mine, it is fused
electrically and weighs 13 pounds.
60
—
VC ROUND VOLUME MINE
I l/-
.30
i
W1OMA1M UAO
Produced locally in VC mine f’ac~ories,
this mine is a prototype of numerous other
VC-manufactured explosive devices. Con-
structed of sheet metal, with welded seams,
it generally weighs about 15 pounds, of
which 13 pounds are explosive. Command
detonated, it is fused electrically and
employs two detonators, one in each end of
the mine. The same principle of construc-
tion is applied to salvaged artillery shell
casings, expended LAAW launchers, and most
other devices using metal containers.
61
. . . ,,
VC BOX MINE AND DEMOLITIONS
m
.—
Tll)l-
TlPECCOBAHHbI14
The VC box mine is constructed of wood
utilizing discarded ammunition boxes or any
scrap material. Mine detectors will not
locate these devices. They can be water-
prool’cd with plastic sheeting. Box mines
arc produced in various sizes but the most
common contains about 40 pounds of explosive.
The mine can be fused for command detonation
or self-detonation by the use of various
devices. The explosive charge is usually
made up of standard Soviet or Chinese
Communist l-pound demolition blocks.
62
iii .
B-40 ANTITANK BOOBYTRAP
RPC ROUND
11006 TER
S* MBOO POLK
48 DEGRCCS
Wlnr
ANT I TANK 8ooflYrRflP
A length of bamboo is emplaced at an
angle of 45 degrees along the shoulder of
a road. A B-40 rocket is then placed in
the bamboo tube and fired electrically by
command detonation as the tank or vehicle
crosses the line of fire.
63
%-
@
.
l,.
SOVIET ANTTTANK MINE ‘I’M-41
------
Constructed of blued steel, sometimes
painted olive drab or white, the TM-41
carries an explosive charge of 8 pounds
and ilasa total weight of 12 pounds. A
force of 350 pounds of pressure on the lid
will activate the firing device.
With
very little additional waterproofing
it
can remain operational indefinitely.
64
-.
iii ..
CHINESE COMMUNIST MIA1
ANTITANK MINE
Manufactured in Communist China, this
mine is similar to and often mistaken for
a U.S. pre-World War II mine.
Made of
metal, it is painted olive drab with the
yellow markings IIMINEMlAl-TNT”,
It iS
activated by 200 pounds of pressure on
the pressure plate.
This mine contains
4 pounds of explosive and weighs 11.5
pounds .
65
ANTIHELICOPTER MINING
The degree of success that the employ-
ment of helicopters has had on restricting
and containing VC/NVA activities is evi-
denced by the enemy’s efforts to destroy
or neutralize these machines.
In addition
to intense ground fire, the enemy has
devised numerous helicopter landing zone
destruction systems. Such destruction
systems range from the primitive planting
of long pointed stakes to imaginative
explosive devices. Because of its design,
the helicopter is extremely vulnerable to
these devices, particular the rotors and
airframe.
******
HELICOPTER EXPLOSIVE TRAPS
Grenades, artillery/mortar rounds, or
any other type of exploding ordnance are
mounted in trees or on the surface of the
landinc zone.
The explosive devices are
rigced for tripwire detonation and the
66
wire is strung to loosely emplaced poles.
The rotorwash of landing helicopters will
blow the poles from their loose position,
tripping the device.
******
A 13-year-old Vietnamese boy recently
claimed that the VC had forced him to
reconnoiter helicopter landing zones. The
boy was instructed by the VC to place
handgrenades In the zones with strings
wrapped around the levers, pieces of paper
attached to the free ends of the strings
and the rings (pull rings) pulled. Rotor-
wash from landing helicopters would then
blow the paper, unwrap the string, and
release the safety lever.
a
67