The Navy completed the digital twin models of all four public shipyards in October 2021, a significant step in the service's 20-year Shipyard Infrastructure Optimization Program, a Navy spokesman told Inside Defense Friday. Bill Couch, a Naval Facilities Engineering Systems Command spokesman, said the digital twins, also called industrial modeling and simulation, are aiding the Navy as it moves forward with the SIOP. “Industrial modeling and simulation is being used in conjunction with detailed engineering studies and master planning...