FM 21-60 (ARMY FIELD MANUAL 21-60), VISUAL SIGNALS (30 SEPT 1987)

FM 21-60 (ARMY FIELD MANUAL 21-60), VISUAL SIGNALS (30 SEPT 1987)., 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 the recognition and identification of friendly forces..