Col. Richard Lindlan, right, outgoing 11th Operations Group commander, relinquishes the 11 OG guidon to Col. Bradley Hoagland, 11th Wing/Joint Base Andrews commander, during the 11 OG change of command ceremony June 23, 2015, at Joint Base Anacostia-Bolling, District of Columbia. During his tenure, Lindlan commanded more than 460 chaplains, musicians, ceremonial guardsmen and staff in performing approximately 2,500 missions each year. (U.S. Air Force photo by Senior Airman Preston Webb/RELEASED)