Lt. Col. Michael Colvard (right) accepts command of the 28th Aircraft Maintenance Squadron from Col. James Katrenak, 28th Maintenance Group commander, during a ceremony at Ellsworth Air Force Base, S.D., June 29, 2012. The 28th AMXS is the largest squadron in the 28th Bomb Wing with more than 700 Airmen, supporting 28 combat coded B-1 bombers. (U.S. Air Force photo by Airman 1st Class Alystria Maurer/Released)