Air Force reservist, Staff Sgt. Daniel Romine, a member of the 442nd Civil Engineer Squadron, studies his Air Force Airman's Manual while in a simulated bunker as he waits for sweep teams to check a tactical-exercise area during an operational-readiness Exercise at Whiteman Air Force Base, Mo. The squadron's parent unit, the 442nd Fighter Wing, is an Air Force Reserve A-10 Thunderbolt II unit based at Whiteman. (US Air Force photo/Master Sgt. Bill Huntington)