6-30: Challenge and Password Outside of Friendly Lines

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6-30. The challenge and password from the signal operating instructions must not be used when the patrol is outside friendly lines. The unit’s tactical SOP should state the procedure for establishing a patrol challenge and password as well as other combat identification features and patrol markings. Two methods for establishing a challenge and password are the odd number system and running password.

Next: 6-31: Odd Number System

Go Back To: U.S. Army FM 3-21.8: The Infantry Rifle Platoon and Squad