http://www.tpub.com/content/combat/14234/css/14234_305.htm
COMBAT SIGNALS Oral (that is, voice) communication is often difficult or impossible under combat conditions. At times, complete silence must be maintained. Under such conditions, signals are used to transmit commands or information. Three types of combat signals are used:
1. Whistle signals
2. Special signals
3. Arm and hand signals
Understanding combat signals is important for a fire team. Make sure you become thoroughly familiar with each signal described in this section. Bear in mind, too, that practice in the use of combat signals is essential if the signals are to be used effectively.
