Senior Airman Nolan Ritter, 628th Logistics Readiness Squadron, performs burpees during a crossfit competition Aug.2, 2013, at the Fitness Center on Joint Base Charleston, S.C. The monthly Commander's Challenge consisted of a crossftt competition and volleyball game matches between squadrons. The monthly Commader's Challenge is a Wing initiative intended to encourage resident interaction and camaraderie as partof Comprehensive Airman Fitness. (U.S, Air Force photo/Tech. Sgt. Douglas)

Airmen watch different squadrons compete in volleyball during the monthly Commander's Challenge Aug. 2, 2013, at the Fitness Center on Joint Base Charleston, S.C. (U.S, Air Force photo/Tech. Sgt. Douglas)

An Airman from the 437th Aerial Port Squadron jumps to spike volleyball against Navy Sailors during a match Aug. 2, 2013, at the Fitness Center on Joint Base Charleston, S.C. (U.S, Air Force photo/Tech. Sgt. Douglas)