Staff Sgt. Matthew Eichner and Senior Airman Amaris Serrano, 28th Security Forces Squadron base defense operations center controllers, fold the American flag in honor of fallen security forces personnel and police officers during a National Police Week retreat ceremony at Ellsworth Air Force Base, S.D., May 14, 2015. Since 1791, more than 19,000 U.S. police officers have passed away while serving their communities. (U.S. Air Force photo by Senior Airman Hailey R. Staker/Released)