U.S. TRANSCOM General Says Domestic Maritime Industry is “Fourth Arm of Defense.” On National Maritime Day, Calls Industry Critically Important to National Security. U.S. TRANSCOM Commanding General William Fraser III today said maintaining a strong domestic maritime industry is critical to the defending the homeland, describing the sector as the “fourth arm of defense.” The Air Force General’s remarks came at a National Maritime Day celebration at the Washington Navy Yard. “Maintaining…