First Lt. Seth Cross, 28th Maintenance Squadron aircraft maintenance officer, explains the GBU-38 and GBU-31 munitions displays to Vietnam War veterans and their spouses at Ellsworth Air Force Base, S.D., May 21, 2015. The event brought together active-duty Airmen with veterans of past generations to commemorate those who have made the ultimate sacrifice. (U.S. Air Force photo by Senior Airman Hailey R. Staker/Released)