The new HC-130J aircraft are derived from the Lockheed Martin KC-130J tanker operated by the U.S. Marine Corps. The USCG has six HC-130Js in service, but they are not capable of refueling helicopters in flight. The first delivery of this variant to the United States Coast Guard was in October 2003. They initially operated in a logistic support role until they received significant modifications, including installations of a large window on each side of the fuselage to allow crew members to visually scan the sea surface, the addition of an inverse synthetic aperture sea search radar, flare tubes, a forward-looking infrared/electro-optical sensor, a gaseous oxygen system for the crew and an enhanced communications suite. Aircraft are installed with the Minotaur Mission System and incorporates sensors; radar; and command, control, communications, computers, intelligence, surveillance and reconnaissance equipment and enables aircrews to gather and process surveillance information that can be transmitted to other platforms and units during flight.