FM 3-19.4 - Army Electronic Publications & Forms - U.S. Army

FM 3-19.4
their vehicles, move to a concealed position, if possible,
and stop. Stationary vehicles are more difficult for the
enemy to detect than moving vehicles.
3-35. Early warning (quick recognition of enemy aircraft)
is a passive air defense method that affords MP an
opportunity to take cover and one that may lead into
active air defense measures. The warning may come
through communication channels, OP and listening
posts (LPs), or from convoy air guards. A whistle, a
voice, a radio, or any other method can provide a warning.
3-36. All OP/LPs watch for enemy aircraft as a standard
duty. When air sighting, the first person to see an enemy
aircraft shouts, "Aircraft," then, "Front (Right, Left, or
Rear)." In a convoy, air guards are given sectors of the
sky to observe for enemy aircraft. When an enemy
aircraft is spotted, the predetermined alarm (such as a
horn or hand signal) is given until all vehicles are aware
of the situation.
3-37. When an alarm is given, all dismounted troops
take cover at once. They go below ground level, if
possible. If the aircraft is not firing, MP withhold their
fire to avoid disclosing their position and they allow the
aircraft to pass. They stay concealed until the all clear is
given. The MP leader initiates a size, activity, location,
unit, time, and equipment (SALUTE) report (or refer to
the SOP) for the sighting of hostile aircraft.
3-38. Active Air Defense Measures. Although passive
measures are the first line of defense against air an
attack,MPmustbepreparedtoengageenemyaircraft.
Low-flying hostile aircraft may appear suddenly from
behind low hills, trees, or a haze. To gain surprise, they
may attack with the sun behind them. Before MP fire at
enemy aircraft, they must positively identify the aircraft
as hostile. If the aircraft is making a firing run on the
patrol, take cover and return fire. However,
commanders may restrict active air defense when
friendly aircraft are in the area.
Shoot, Move, and Communicate 3-15