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)