Members of the 11th Security Forces Squadron ruck-march down perimeter road on Joint Base Andrews, Md., May 11, 2015, during National Police Week. Approximately 35 security forces members participated in the ruck-march, where they were required to carry a ruck-sack weighing a minimum of 35 lbs. (U.S. Air Force photo by Senior Airman Mariah Haddenaham/Released)