160126-N-CB621-033 PEARL HARBOR (Jan. 26, 2016) Adm. Frank Caldwell, director of the Naval Nuclear Propulsion Program, left, speaks with leaders of the Pacific Submarine Force during a visit to Pearl Harbor, Hawaii. Caldwell, with Command Master Chief Frank Gardner, visited Pearl Harbor as part of a tour throughout the Pacific theater to review operations and build relationships in the region. (U.S. Navy photo by