United States Navy

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The United States Navy Ceremonial Guard stretches a large U.S. Flag across the field during the playing of the National Anthem before the baseball home opener between the Atlanta Braves and Washington Nationals at Nationals Park Friday, April 4, 2014, in Washington. (AP Photo/J. David Ake)

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The United States Navy Ceremonial Guard stretches a large U.S. Flag across the field during the playing of the National Anthem before the baseball home opener between the Atlanta Braves and Washington Nationals at Nationals Park Friday, April 4, 2014, in Washington. (AP Photo/J. David Ake)

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U.S. Navy captain Mark Matthews, right, Royal Australian Navy commodore Peter Leavy, center, and chief of the navy Vice Admiral Ray Griggs stand on the dock before a press conference at naval base HMAS Stirling about the defense ship Ocean Shield and her roll in the search for missing Malaysia Airlines Flight MH370 in Perth, Australia, Sunday, March 30, 2014.(AP Photo/Rob Griffith)

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In this April 26, 2004, file photo provided by the U.S. Navy, the USS Miami SSN 755, homeported in Groton, Conn., arrives in port in Fort Lauderdale, Fla. (AP Photo/U.S. Navy, PH2 Kevin Langford, files)

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CORRECTS DATE OF INCIDENT TO MONDAY NOT TUESDAY This undated photo made by the U.S. Navy and provided by the family of Mark Mayo shows military policeman Mark Mayo, who was killed Monday, March 24, 2014 when a civilian approached a destroyer docked at Naval Station Norfolk in Norfolk, Va., and disarmed a sailor on watch. The civilian then shot Mayo when he came to help. (AP Photo/U.S. Navy)