A member of the United States Naval Academy freshman class wears body armor, helmet and carries a rifle through a mud-filled ditch as part of the “Wet and Sandy” challenge during the rigorous Sea Trials May 17, 2011 in Annapolis, MD. Under strict safety supervision, about 900 freshmen, or “Plebes”, faced 14 hours of 32 rigorous physical and mental challenges during the trials, a daylong, action-oriented event modeled after the Marine Corps 54-hour Crucible and the Navy's Battle Stations. (Photo by Chip Somodevilla/Getty Images)

Members of the United States Naval Academy freshman class practice ground fighting techniques during the rigorous Sea Trials May 17, 2011 in Annapolis, Maryland. U (Photo by Chip Somodevilla/Getty Images)

Members of the United States Naval Academy freshman class link arms and lay back into the Severn River as part of the “Wet and Sandy” challenge during the rigorous Sea Trials May 17, 2011 in Annapolis, MD. (Photo by Chip Somodevilla/Getty Images)

Members of the United States Naval Academy freshman class do sit-ups as a team with heavy logs during the rigorous Sea Trials May 17, 2011 in Annapolis, Maryland. (Photo by Chip Somodevilla/Getty Images)

Members of the United States Naval Academy freshman class participate in the pipe patching exercise during the rigorous Sea Trials May 17, 2011 in Annapolis, Maryland. (Photo by Chip Somodevilla/Getty Images)

Members of the United States Naval Academy freshman class conduct a mock raid as part of the military operations/urban terrain squad exercises during the rigorous Sea Trials May 17, 2011 in Annapolis, Maryland. (Photo by Chip Somodevilla/Getty Images)

Members of the United States Naval Academy freshman class help each other over the Dong Ha Bridge exercise during the rigorous Sea Trials May 17, 2011 in Annapolis, Maryland. (Photo by Chip Somodevilla/Getty Images)

A member of the United States Naval Academy freshman class carries another during tough physical exercise during the rigorous Sea Trials May 17, 2011 in Annapolis, MD. (Photo by Chip Somodevilla/Getty Images)

A United States Naval Academy freshman pours water out of her boot and eats a quick snack during the rigorous Sea Trials May 17, 2011 in Annapolis, MD. (Photo by Chip Somodevilla/Getty Images)

Members of the United States Naval Academy freshman class Company 16 lead a two-mile run across the Naval Academy Bridge during the rigorous Sea Trials May 17, 2011 in Annapolis, MD. (Photo by Chip Somodevilla/Getty Images)