110411-N-PO203-042 NATIONAL HARBOR, Md. (April 11, 2011) Rear Adm. Nevin P. Carr, Chief of Naval Research, completes a tour of the Piranha unmanned surface vehicle at the 2011 Sea-Air-Space Exposition sponsored by the Navy League. ( Navy photo by John F. Williams/Released) US Navy 110411-N-PO203-042 Rear Adm. Nevin P. Carr, Chief of Naval Research, completes a tour of the Piranha unmanned surface vehicle at the 2011 S

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Photo credit: © PJF Military Collection / Alamy / Afripics
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