Staff Sgt. Donald Johnston, a 442nd Aircraft Maintenance Squadron A-10 crew chief, makes good use of bunker time in Alarm Black by studying his Airman's Manual during an operational readiness exercise in February, 2009. Sergeant Johsnton and other 442nd Fighter Wing members will have the chance to put their knowledge, as well as their experience to the test as the 10th Air Force Readiness Assistance Visit plays out May 13 to 17. The 442nd Fighter Wing is an Air Force Reserve Command unit based at Whiteman Air Force Base, Mo. (U.S. Air Force photo/Master Sgt. Bill Huntington)