Observation posts are positions where soldiers watch
and listen for enemy activity in an assigned area OPs provide security and intelligence for the platoon. Platoons establish
and maintain OPs as the company commander directs (normally one per platoon).
When planning an OP the platoon leader must consider
a. Siting. Normally the platoon
leader identifies the general location and the squad leader selects the actual site for the OP.
(1) OPs must be sited to allow observation of the
(2) OPs should also be sited to take advantage of
natural cover and concealment to provide protection for the soldiers manning it.
(3) OPs should be located within small-arms range
of the platoon positions.
b. Observation. When he identifies
the general location for the OP. the platoon leader must also indicate the area to be observed and any specific instructions
covering what soldiers are to look for or be especially alert to. The area observed may be a sector, one or more avenues of
approach (normally one per OP), a named area of interest (NAI), or a target reference point (TRP). OPs should also require
minimal repositioning for limited visibility.
c. Cover and Concealment. Sometimes
the requirement for fields of observation may make it difficult to achieve cover and concealment. Some techniques include--
- Avoid obvious terrain such as hilltops.
- Avoid easily identifiable terrain features such as
water towers, church steeples, tallest buildings, lone buildings or trees, or isolated groves.
- Avoid routes or positions that skyline soldiers.
- Select a covered and concealed route to and from
d. Communications. Soldiers
must be able to report what they see and hear. Wire is the primary means of communications between the OP and the platoon.
If possible, the OP should have radio communications as a backup. An additional soldier may be added as a messenger if no
other means of communication is available. The SOP should specify how often OPs make routine communications checks. When the
platoon loses wire communications with the OP, the leader always details at least two soldiers to check and repair the line--one
for security, one for repair. Soldiers checking for breaks in wire should always approach the OP with caution in case the
enemy has captured and occupied it.
e. Manning. At least two soldiers
must man each OP. A fire team may man the OP if it will remain in place or not be relieved for long periods. All soldiers
prepare fighting positions at the OP for protection and concealment. Additionally, each soldier must have a prepared position
to return to in the platoon position.
f. Additional Instructions.
In addition to the intelligence and security reporting requirements, the squad leader also briefs the soldiers manning the
OP on the challenge and password, the running password, when to engage and when not to engage the enemy, conditions when the
OP can withdraw, when to expect relief, and contingency plans for loss of communications.
g. Equipment. Special equipment
for the OP includes binoculars, maps, a compass, night vision devices (goggles or an antiarmor thermal sight), trip flares
and other alert devices, a field phone, paper and pencil, and a watch.
ACTIONS AT THE OBSERVATION POST
Once the squad leader has positioned and briefed the
soldiers at the OP site, one soldier always observes and records while the remainder perform(s) the actions listed below:
- Establish security. Install trip flares and noise-making
- Prepare positions to include range cards. Record
data for use in requesting and adjusting fire; for example, azimuths and ranges to TRPs.
- Make communications checks or report as required.
- Rotate duty as the observer every 20 to 30 minutes.
An observer's efficiency quickly decreases after that time.
- Brief relieving soldiers on any information or special
instructions before departing the OP. The frequency of reliefs for OPs depends on the physical condition of the soldiers,
weather conditions, morale, the number of soldiers available for relief, and the requirements of the next operation. As a
guide, OPs should be relieved every two to four hours.
- Withdraw as directed or to avoid capture. Soldiers
manning the OP advise the platoon leader that they are returning and request support (direct or indirect) if needed. Leaders
must alert all soldiers in the platoon when reliefs move to or from the OP, and when it withdraws.
SQUAD-SIZED OBSERVATION POST
A squad may occupy one OP to add security and combat
power when the platoon has a mission to screen the flank of a larger force or to secure a large area. The squad-sized OP allows
the platoon to observe from OPs and to conduct patrols between them. Leaders use the same considerations listed above in planning
and siting squad-sized OPs. The squad leader spreads his soldiers out in two-or three-soldier positions. Each position acts
as an OP to observe an assigned sector.
VISUAL TERRAIN SEARCH
A visual terrain search involves the two steps discussed below. (See Section XIV for a detailed discussion of night vision.) Observation posts report
all information quickly, accurately, and completely. They make sure that the report answers the questions WHO, WHAT, WHERE,
and WHEN. It is best to use the SALUTE format when reporting information.
a. Step 1. The observer makes an overall search of the entire area for obvious targets, unnatural colors, outlines, or movement.
To do this quickly, he raises his eyes from just in front of his position to the greatest range he wants to observe. If the
sector is wide, he observes it in sections. (Figure 2-88.)
b. Step 2. He observes overlapping
50-meter wide strips, alternating. from left to right and right to left until he has observed the entire area. (Figure 2-89.) When he sees a suspicious spot, he searches it well.
LIMITED VISIBILITY TECHNIQUES
The infantry fights at night to take advantage of
limited visibility. The use of NVDs and scanning techniques aids the infantryman in operating during all limited visibility
conditions. This section provides techniques for improving and maintaining night vision, and techniques for attacks during
Darkness affects the senses of sight, hearing, and
smell. Sharpening these senses requires training. Soldiers must know how their eyes function at night to best use them.
a. Night Vision Scanning. Dark
adaptation is only the first step toward making the greatest use of night vision. Scanning enables soldiers to overcome many
of the physiological limitations of their eyes. It can also reduce confusing visual illusions. This technique involves looking
from right to left or left to right using a slow, regular scanning movement (Figure 2-92). At night, it is essential to avoid looking directly at a faintly visible
object when trying to confirm its presence.
b. Use of Off-Center Vision.
The technique of viewing an object using central vision is ineffective at night. This is due to the night blind spot that
exists during low illumination. Soldiers must learn to use off-center vision. This technique requires viewing an object by
looking 10 degrees above, below, or to either side of it rather than directly at it (Figure 2-93).
c. Countering of the Bleach-Out
Effect. Even when soldiers practice off-center viewing, the image of an object bleaches out and becomes a solid tone when
viewed longer than two to three seconds. By shifting his eyes from one off-center point to another, the soldier can continue
to pick up the object in his peripheral field of vision.
d. Shape or Silhouette. Visual
sharpness is greatly reduced at night; therefore, objects must be recognized by their shape or outline. Knowing the design
of structures common to the area of operations enhances success with this technique.
Dark adaptation is the process by which the human
body increases the eyes' sensitivity to low levels of light.
a. Soldiers adapt to darkness at varying degrees and
rates. During the first 30 minutes in the dark, eye sensitivity increases about 10,000 times, but not much alter that.
b. Dark adaptation is affected by exposure to bright
light such as matches, flashlights, flares, or vehicle headlights. Full recovery from these exposures can take up to 45 minutes.
c. Using night vision goggles impedes adaptation.
However, if a soldier adapts to the dark before donning the goggles, he gains full dark adaptation within 2 minutes when they
d. Soldiers must know that color perception decreases
at night. They may be able to distinguish light and dark colors depending on the intensity of reflected light.
e. Visual acuity is also reduced. Since visual sharpness
at night is one-seventh of what it is during the day, soldiers can see only large, bulky objects. This means that object identification
at night is based on generalized contours and outlines. Depth perception is also affected.
Although night vision devices can help the soldier see at night, they degrade the other senses. Ability
to hear, smell, and feel decreases because of the concentration required to use NVDs effectively. Leaders should prepare for
night operations by using all the senses. On certain operations, this may require that some soldiers not use NVDs.
PLANNING THE USE OF NIGHT VISION/SENSOR ASSETS
Leaders must develop a night vision plan that interlocks
sectors of NVD employment much like that planned for interlocking weapon fire sectors. Often, using NVDs requires repositioning
to ensure full coverage of an area. Thermal sights should be kept on a wide field of view until engagement or sector coverage
will have gaps. To best use weapons with image intensification nightsights, some NVDs should be used forward of the firing
positions to aid in target identification. Night OPs using NVDs can provide target identification for direct-fire weapons
and then, with the use of tracers, quickly direct fire onto targets. Use of a three-soldier element at squad level during
movement can enhance enemy detection and destruction.
- One soldier uses unsupported night-adapted vision.
- One soldier uses the AN/PVS-7.
- One soldier uses the AN/PVS-4 mounted on the M16
NIGHT OPERATION TIPS AND TECHNIQUES
To the infantryman, the dark of night is a helper.
It offers advantages to the soldier familiar with operating during darkness, but to those not familiar with darkness, the
known appears to become the unknown.
a. Land Navigation.
(1) Routes may be marked with chemical lights, flashlights,
or cans filled with diesel-soaked dirt and set alight. Special precautions must be taken to ensure that markers are shielded
from enemy observation.
(2) Luminous panels can be used to identify vehicles,
road guards, and turning points. Panels are arranged in various patterns for different unit identification.
(1) The first rule of night operations: do not ignore
the night capability of devices not usually considered night operations equipment; for example:
- Binoculars, direct-fire scope, or any image-magnifying
optical equipment will also enhance night vision because they focus more light in the eye than the unaided eye can gather.
- The lensatic compass has luminous markings and detents
that allow it to be set for night navigation without using a light.
(2) Ground surveillance radars are effective when
oriented along the direction of attack to report and correct deviations for the attacking force. GSRs are also effective when
employed in combination with thermal sight equipment to overwatch movement of attacking forces.
(3) At ranges of less than 800 meters, operators tend
to underestimate range by as much as 25 percent. Range estimation errors can be reduced by teaching operators to relate targets
to terrain features at ranges determined by daylight reconnaissance and map study.
(4) Rough triangulation from two or more night observation
posts is useful in reducing range estimation errors.
(5) For moving targets, a ground surveillance radar
can provide effective target location information.
(6) Seismic, magnetic, and electromagnetic sensors
can detect the presence of personnel or vehicles; however, these systems cannot discriminate between types of vehicles or
between civilians and enemy. For this reason, night observation devices must be used in combination with sensors.
(7) Long-range systems and devices are employed at
the maximum range that terrain and operator expertise will allow to permit early identification of advancing targets.
(8) Proper use of infrared aiming devices, such as
the AN/PAQ-4(A), can greatly enhance a platoon's night fighting capability. Care must be taken to ensure that the devices
are properly mounted and zeroed to the weapon. Indiscriminate or unsupervised use can result in compromising a platoon's position,
whether in offense or defense. Proper use of scatter shields can significantly reduce this risk of early detection. These
devices may be particularly effective in a MOUT environment.
(1) Flares should be dropped at irregular intervals
beyond and on line with the objective to provide orientation. This technique compromises surprise, however, and should be
used only in emergency situations or when a subunit becomes so disoriented it hampers mission success.
(2) Areas other than the attack areas may be illuminated
to mislead the enemy.
d. Smoke Obscurants.
(1) White phosphorus smoke can be fired on the objective
as a heading reference.
(2) Smoke is as effective at night as in the day in
reducing visibility. Except for thermal imagery devices, electro-optical night observation devices cannot penetrate heavy
(1) Noise signatures are reduced as much as possible.
(2) Rock-filled cans suspended on barrier wire or
across approach routes into defensive positions can provide intrusion warning.
(3) Blue light is much more difficult to see at night
than red light. Unlike red light, however it dots not hamper night vision.
(4) Command posts and trains have problems with security
at night because of their high noise signature from generators. The noise may be masked by placing generators in pits and
surrounding them with bales of hay or vehicles. Placing generators in wooded or built-up areas not only helps dampen the noise,
but scatters it as well, making it harder to pinpoint the noise source.
f. Engineer. Engineer missions
do not change during darkness, but employment may. For a night attack, the engineers move forward with infantry to begin breaching
operations under cover of darkness; they must mark their breaches, however, so the main body can find them with a minimum
of trouble. Chemical lights or fluorescent tape on stakes is a good technique. The first unit to move through the breach sends
back guides to meet other units and guide them through the enemy obstacle system.
(1) All night maneuvers are kept simple. Complex operations
at night may not work.
(2) Animals of all types--cows, monkeys, wild boars,
horses, dogs, buffalo--have been used successfully by other armies throughout history to probe enemy defenses and cause the
defender to reveal gun positions, minefields, barriers, and wire.
(3) Commanders should consider occupying alternate
or supplementary positions after dark so that the attacker's artillery fires and assault will be directed against an unoccupied
(4) Consideration should be given to relocating reserves
after dark, since the enemy may prefer to use artillery rather than maneuver to breakup counterattacks.
(5) Reserve units whose position has been detected
in the daytime should be moved, if at all possible.
(1) Apprehension rises significantly during darkness,
and it becomes more difficult to get soldiers to eat, especially if combat is anticipated. They must then contend with the
natural "low" that occurs between 0300 and 0600 hours.
(2) Sleep deprivation has numerous effects on the
body, and commanders should be aware of this during planning.
(3) When planning night operations, consideration
must be given to the method that will be used to mark locations where casualties are to be collected so they can be found
by medical personnel and evacuated. Collecting casualties at the assault position or objective rally point is a technique
that can speed evacuation.
(4) The commander of a unit that is to conduct a night
attack must give thought to his litter teams, especially how he will man them.
(5) Aidmen must reconnoiter the routes from casualty
collection points to the battalion aid station during daylight and again during darkness. This is especially critical during
a night defense.
i. Combat Service Support.
(1) Leaders should plan for a significant increase
in consumption of batteries, flashlights, and illumination rounds (including tracers) when planning for night operations.
(2) If aerial resupply is to be used, a method to
guide the aircraft into position is required. A directional light source, such as a strobe light or a chemical light on a
helmet, may be used.
(3) Ammunition prestock efforts require careful planning
if they are to be effective. Prestock locations must be clearly identified and marked so they can be found during darkness,
even by a unit other than the one that installed the prestock.