U.S. Marine Pfc. Marc Calo lays in the surf after coming ashore during operation "Dawn Blitz" at Camp Pendleton, Calif., Friday, June 4, 2010. About 5,000 Marines and Navy sailors participated in the largest amphibious exercise on the West Coast since the Sept. 11, 2001, terrorist attacks. (AP Photo/Chris Carlson)

U.S. Marine Pfc. Marc Calo lays in the surf after coming ashore during operation "Dawn Blitz" at Camp Pendleton, California. Friday, June 4, 2010. He was one of about 5,000 Marines and Navy sailors who participated in the largest amphibious exercise on the West Coast since the Sept. 11, 2001, terrorist attacks. (AP Photo/Chris Carlson)