ROK Army, U.S. forces strengthen alliances Published Sept. 10, 2012 By Airman 1st Class Alexis Siekert 51st Fighter Wing Public Affairs OSAN AIR BASE, Republic of Korea -- The Republic of Korea Army and 51st Security Forces Squadron leadership met to discuss air base defense tactics at Osan Air Base, ROK, Sept. 5, 2012. Throughout the afternoon, ROK Army representatives toured Osan's defensive fighting positions. The purpose of the tour was to strengthen the alliance between the two forces. (U.S. Air Force photos/Airman 1st Class Alexis Siekert)