Lt. Col. Nicholas Evans, 36th Fighter Squadron commander, briefs Gen. Lee, Sun-Jin, Chairman of the Republic of Korea Joint Chiefs of Staff and Joint Defense Headquarters chief director, during a recent visit to Osan Air Base, ROK, Jan. 11, 2016. Lee visited Team Osan to discuss the US/ROK alliance after recent provocative action by North Korea. He toured various facilities across the base and spoke with leadership, reinforcing the bond between the ROK and U.S.