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150416-N-XP344-048 CHARLESTOWN, Mass. (April 16, 2015) NASA astronaut and U.S. Navy SEAL Capt. Christopher J. Cassidy conducts an all-hands call with the crew of USS Constitution during a visit to the ship. Cassidy's visit to Charlestown Navy Yard was part of an East Coast tour that included him visiting Boston and New York City public schools, the New England Center for Homeless Veterans, the Boston Museum of Science and the 9/11 Memorial. (U.S. Navy photo by Mass Communication Specialist 3rd Class Victoria Kinney/Released)
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