$25B in Navy shipyard improvements proposed in U.S. Senate By A $25 billion bill to improve Navy shipyards, including the Portsmouth Naval Shipyard in New Hampshire, pictured, was introduced in the U.S. Senate on Tuesday. Photo by Endrick Dickson/Naval Sea Systems Command April 28 (UPI) -- Senate legislation, introduced on Wednesday, calls for a $25 billion investment in public and private shipyards that build and maintain the U.S. Navy fleet. The bill allocates allocate $21 billion under the Defense Production Act to four public shipyards for the Navy's Shipyard Infrastructure Optimization Program. Advertisement Another $2 billion would go to private shipyards that build Navy ships, with $2 billion dedicated to commercial ship repair yards.