Airmen from the 28th Security Forces Squadron form a rifle team during a special retreat ceremony as part of a National Police Week at Ellsworth Air Force Base, S.D., May 19, 2016. The retreat ceremony was done to honor Air Force security forces members and South Dakota law enforcement personnel who gave their lives in the line of duty. (U.S. Air Force photo by Airman 1st Class Denise M. Nevins/Released)