SHAW AIR FORCE BASE, S.C. -- Staff Sgt. Derrick Kennington, 20th Civil Engineer Squadron, and Staff Sgt. Ferdinando Acerra, 20th Maintenance Operations, spar at the fitness center here Feb. 20, 2011. Sergeants Kennington and Acerra are part of a mixed martial arts team that train and compete out of Columbia, S.C. (U.S. Air Force photo/Airman 1st Class Daniel Phelps)
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