Republic of Korea Air Force Master Sgt. Yong Hwan Han, a barrier maintenance supervisor, secures contour ropes to a base frame for a small shelter system setup during Partner Nation Silver Flag, Feb. 13, 2016, at Andersen Air Force Base, Guam. The exercise is a small part of the first multilateral Silver Flag Exercise, a U.S. Pacific Command multilateral Theater Security Cooperation Program subject matter expert exchange event designed to build partnerships and promote interoperability through the equitable exchange of civil engineer related information. (U.S. Air Force photo by Senior Airman Joshua Smoot/Released)