U.S. Army Maj. Charles Rozek, left, with I Corps, and Sgt. 1st Class Otis Cadd, with the 593rd Sustainment Command, track and coordinate transportation of supplies and personnel during Yama Sakura 65 at Camp Higashi-Chitose, Japan, Dec. 6, 2013. YS is an annual, bilateral exercise between the U.S. military and the Japan Self-Defense Forces. YS is the largest command post exercise that focuses predominantly on the bilateral and joint planning, coordination and interoperability of ground-based elements of the U.S./Japan security alliance.