An aircrew stands for a photograph to commemorate the final flights of Col. Denis Heinz and Lt. Col. Pete Costas June 7, 2015, Barksdale Air Force Base, La. Heinz will be leaving the 307th Bomb Wing to command the 489th Bomb Group at Dyess AFB, Texas, and Costas is retiring from the Air Force Reserve after almost 30 years of service. (U.S. Air Force photo by Master Sgt. Dachelle Melville/Released)