Colorado Air National Guard Col. Brian P. Patterson, commander, 140th Maintenance Group, receives a traditional champagne spraying after completing his final flight, Mar. 6, 2016, Buckley Air Force Base, Aurora, Colo. Patterson is retiring after 31 years of service in the United States Air Force and Colorado Air National Guard. (U.S. Air National Guard photo by Staff Sgt. Michelle Y. Alvarez-Rea)