Chief of Naval Operations U.S. Navy Adm. Jonathan Greenert delivers the keynote remarks at a dedication of an exhibit of artifacts from the submarine NR-1 Wednesday, June 24, 2015 at the Submarine Force Library and Museum in Groton, Conn. Greenert served as engineer aboard the NR-1 early in his navy career. The NR-1 was a nuclear powered deep diving research and recovery vessel from the time of its launch in 1969 until it was decommissioned in 2008. The exhibit includes the sail with periscope mast and fairwater planes, the upper rudder two propellers and a manipulator arm. (Sean D. Elliot/The Day via AP)
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