Infantry Drills

5-139: Perimeter Defense



Previous: 5-138: Cigar-Shaped Perimeter

5-139. When operating independently, the platoon uses a perimeter defense during extended halts, resupply, and issuing platoon orders or lulls in combat. Normally the unit first occupies a short halt formation. Then after conducting a leader’s reconnaissance of the position and establishing security, the unit moves into the perimeter defense.

Next: 5-140: Mounted Security Halt

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