Safety / Survival / Army Field Manuals / AFM 3-05.70
19-1. If in a noncombat situation, you need to find the largest available
clear and flat area on the highest possible terrain. Use as obvious a
signal as you can create. On the other hand, you will have to be more discreet
in combat situations. You do not want to signal and attract the enemy. Pick an
area that is visible from the air, but ensure there are hiding places nearby.
Try to have a hill or other object between the signal site and the enemy to mask
your signal from the enemy. Perform a thorough reconnaissance of the area to
ensure there are no enemy forces nearby.
19-2. Whatever signaling technique or device you plan to use, know how to use
it and be ready to put it into operation on short notice. If possible, avoid
using signals or signaling techniques that can physically endanger you. Keep in
mind that signals to your friends may alert the enemy of your presence
and location. Before signaling, carefully weigh your rescue chances by friends
against the danger of capture by the enemy.
19-3. A radio is probably the surest and quickest way to let others know
where you are and to let you receive their messages. Become familiar with the
radios in your unit. Learn how to operate them and how to send and receive
19-4. You will find descriptions of other signaling techniques, devices, and
articles you can use. Learn how to use them. Think of ways in which you can
adapt or change them for different environments. Practice using these signaling
techniques, devices, and articles before you need them. Planned, prearranged
signaling techniques may improve your chance of rescue.