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Hand and arm signals for United States Army use are laid down in Field Manual 21-60. Hand and Arm signals are one of the most common forms of communication used by United States Army soldiers or group of soldiers when a radio silence is in effect or if the soldiers need to remain undetected.〔(US Army Field Manual 21-60 - Visual Signs )〕 Through the use of these signals military leaders, such as team leaders, squad leaders, platoon leaders, etc..., are able to keep command and control (C2) over their particular element. All new recruits are taught to use the proper hand and arm signals found in the FM. However, it is not uncommon for units to adopt and/or create their own signals. These signals ultimately become known as SOP or standard operating procedure.〔 Visual signals are any means of communication that require sight and can be used to transmit prearranged messages rapidly over short distances. This includes the devices and means used for recognition and identification of friendly forces. == Types of visual signals == There are a number of ways that visual communication can be executed. The most common types are: hand and arm signals, flags, pyrotechnic, chemical-lights and ground-to-air signals. It must be known that soldiers and units are not limited to this select list. Soldiers are only limited in their choice of visual communication by their initiative and imagination, as well as the ability of others to understand what he or she is trying to convey. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Military hand and arm signals」の詳細全文を読む スポンサード リンク
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