U.S. Air Force Master Sgt. Sean Buck, Maintenance Operations Center superintendent, poses with the MOC&#39;s 2015 Diamond Award of Excellence at Spangdahlem Air Base, Germany, March 25, 2015. The MOC was the only active duty Air Force unit to receive the Federal Aviation Administration&#39;s highest maintenance training award in 2015. (U.S. Air Force photo by 2nd Lt Meredith Mulvihill/Released)