U.S. Marine soldiers take a rest on top of a M1A1 battle tank during the Combined Joint Logistics Over The Shore (CJLOTS) exercise, which is part of the annual joint exercise "Foal Eagle" by the U.S. and South Korea, on a seashore in Pohang, about 370 km (230 miles) southeast of Seoul, April 22, 2013. [Photo/Chinanews.com]