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Elementary school students shout "Thanks to my parents!" at a mud flat as they participate in a summer military camp for civilians at the Cheongryong Self-denial Training Camp run by retired marines in Ansan, about 40 km (25 miles) southwest of Seoul, July 21, 2011. Thirty seven students are in the three-day camp to strengthen their spirit and body. [Photo/Agencies]

Elementary school students jump over paddles as they participate in a summer military camp for civilians at the Cheongryong Self-denial Training Camp run by retired marines in Ansan, about 40 km (25 miles) southwest of Seoul, July 21, 2011. [Photo/Agencies]