U.S. sailors and members of the Thai navy's riverine patrol regiment train on a special operations craft during Cooperation Afloat Readiness and Training Thailand 2015 in Sattahip, Thailand, Aug. 27, 2015. The U.S. sailors are assigned to Coastal Riverine Squadron 4. In its 21st year, the annual exercise includes the U.S. Navy, U.S. Marine Corps and the armed forces of nine partner nations. U.S. Navy photo by Petty Officer 1st Class Joshua Scott