Staff Sgt. Nathan Warren, 28th Security Forces Squadron combat arms instructor, explains the function of a variety of weapons on display in the base exchange at Ellsworth Air Force Base, S.D., May 13, 2014. The display, organized in recognition of National Police Week, helped familiarize Airmen, family members and civilians with the weapons the 28th SFS utilizes on the installation. (U.S. Air Force photo by Senior Airman Zachary Hada/Released)