U.S. Air Force Tech. Sgt. Ronald Kavanaugh, 192nd Maintenance Squadron, tightens the sleeve on his chemical gear jacket during a simulated attack as apart of the phase II combined unit exercise, at Langley Air Force Base, Va., Dec. 13, 2012. Wing Exercise Evaluation Team members assessed the ability of the 633rd Air Base Wing, 1st Fighter Wing and 192nd Fighter Wing to deploy. (U.S. Air Force photo by Staff Sgt. John D. Strong II/Released)