U.S. Air Force Col. Joseph Yankovich, 57th Maintenance Group commander, stands in front of the group's headquarter building July 15, 2011, at Nellis Air Force Base, Nev. Yankovich assumed command of the 57 MXG July 8, 2011, and is responsible for 2,200 Airmen and contractors who perform aircraft and munitions maintenance, generate sorties, and meet strict test, tactics and training requirements. (U.S. Air Force Photo by Airman 1st Class Jamie L. Nicley/Released)
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