Col. Kurt Meidel, left, 71st Operations Group commander, congratulations Lt. Col. Chris Callaghan, right, upon taking command of the 71st Operations Support Squadron, during a change of command ceremony held Friday, June 3, in Hangar 199 at Vance AFB, Okla. Holding the 71st OG guidon, center, is Master Sgt. Scott Swain, the group first sergeant. Colonel Callaghan replaced Lt. Col. David Merritt, who will attend Air War College in residence at Maxwell AFB, Ala. (U.S. Air Force photo/ Roger Betz)