NELLIS AIR FORCE BASE, Nev.—Master Sgt. Carlos Guevara, 99th Security Forces Squadron alpha flight commander, briefs his patrolmen during “guard mount” prior to going out on post here May 13. Speaking with Airmen before each shift lets flight commanders make sure Airmen are physically and mentally ready for duty. (U.S. Air Force photo/Staff Sgt. Jacob R. McCarthy)
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