Colonel Monty Perry, 89th Operations Group commander, left, hands the guidon to Lt. Col. Tyler Prevett, incoming 89th Operations Support Squadron commander, during a change of command ceremony March 19, 2010, at Joint Base Andrews, Md. Colonel Prevett was previously chief of Mobility Analysis Branch and deputy chief of Campaign Analysis Division, Headquarters U.S. Air Force, Washington, D.C. (U.S. Air Force photo by Staff Sgt. Keyonna Fennell)