Maj. John Arellanes (right) accepts command of the 28th Maintenance Squadron from Col. James Katrenak, 28th Maintenance Group commander, during a change of command ceremony on Ellsworth Air Force Base, S.D, June 29, 2012. Arellanes, the former 28th Maintenance Operations Squadron commander, now commands more than 460 Airmen providing support for all maintenance equipment and heavy repairs, supporting 28 combat-coded B-1 aircraft and related subsystems. (U.S. Air Force photo by Airman 1st Class Kate Thornton/Released)