FILE - In this Tuesday, July 31, 2012 file photo, Christopher Del Mastro, head of anti submarine warfare mobil targets stands next to an unmanned underwater vehicle (UUV) in a lab at the Naval Undersea War Center in Middletown, RI. President Donald Trump and U.S. Navy leaders have said that the nation needs about 350 ships, roughly 75 more ships than the fleet has today. Adm. John Richardson, chief of naval operations, said they could get closer to the Navy's goal by counting unmanned vehicles that have capabilities similar to a manned ship. (AP Photo/Stephan Savoia, File)
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