(5) Contrast. When constructing letter symbols, contrast the letter from the surrounding vegetation and terrain. Ideally, bring material from another location to build the letter. This could be clothing, air panels, space blanket, etc.
(a) On snow, pile pine bough or use sea dye from a life vest can be utilized.
4. AIR TO GROUND COMMUNICATIONS. Air to ground communications can be accomplished by standard aircraft acknowledgments.
a. Aircraft will indicate that ground signals have been seen and understood by:
(1) Rocking from side to side. This can be done during the day or in bright moonlight.
(2) Making green flashes. This is done with a signal lamp during dark nights.
b. Aircraft will indicate that ground signals have been seen but not understood by:
(1) Making a complete circle to the left during the day or in bright moonlight.
(2) Making red flashes. This is done with a signal lamp during dark nights.
5. RECOVERY. Marines trapped behind enemy lines in future conflicts may not experience quick recovery. Marines may have to move to a place which will minimize risk to the recovery force. A Marine must take responsibility for the safety of the recovery force.
a. Placement Considerations. In a hostile situation, signaling devices should not be placed near the following areas due to the possibility of compromise:
(1) Obstacl es and barri ers.
(2) Roads and trails.
(3) Inhabited areas.
(4) Waterways and bridges.
(5) Natural lines of drift.
(6) Man-made structures.
(7) All civilian and military personnel.
b. Tactical Consideration. The following tactical considerations should be adhered to prior to employing a signaling device.
(1) Use the signal in a manner, which will not jeopardize the safety of the recovery force or you.
(2) Locate a position with good escape routes and observation of avenues of approach. Position should be located relatively close to extract site in order to minimize time spent on ground by the recovery force.
(3) Maintain continuous security while the signaling device is employed.
(4) If enemy movement is detected in the area prior to recovery, attempt to recover or conceal the signal.
(5) Employ signaling devices only during the prescribed times as stated in the mission order.
c. Recovery Devices. (WSVX.02.06d) In mountainous terrain, a helicopter landing may be impossible due to ground slope, snow pack, or vegetation. The survivor must be familiar with recovery devices that may be aboard the aircraft.
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