Formations comprised of Airmen from the four base groups and the 28th Bomb Wing staff participated in a Memorial Day retreat ceremony at Ellsworth Air Force Base, S.D., May 21, 2015. More than 15 veterans of World War II, Vietnam and the Korean War and their family members attended the event in remembrance of those who paid the ultimate sacrifice while defending our nation's freedom. (U.S. Air Force photo by Senior Airman Hailey R. Staker/Released)