BH 17-1 Security Forces "outside the wire"
U.S. Air Force Tech. Sgt. Joseph Roides, 51st Security Forces Squadron flight sergeant, takes part in an “outside the wire” perimeter check during Exercise Beverly Herd 17-1 at Osan Air Base, Republic of Korea, March 1, 2017. Defenders are responsible for daily entry control, base security and police services during peacetime as well as base and area security during contingency situations. (U.S. Air Force photo by Airman 1st Class Gwendalyn Smith)