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6-163. Security patrols prevent surprise of the main body by screening to the front, flank, and rear of the main body and detecting and destroying enemy forces in the local area. Security patrols do not operate beyond the range of communication and supporting fires from the main body; especially mortar fires, because they normally operate for limited periods, and are combat-oriented.
6-164. Security patrols are employed both when the main body is stationary and when it is moving. When the main body is stationary, the security patrol prevents enemy infiltration, reconnaissance, or attacks. When the main body is moving, the security patrol prevents the unit from being ambushed or coming into surprise chance contact.
Next: Section IV: Reconnaissance Patrols
Go Back To: U.S. Army FM 3-21.8: The Infantry Rifle Platoon and Squad