control car (the "D-1 Enclosed Cabin Car" which had a water tight bottom for landings on water and internal fuel tanks. The D-6 was burned in the Naval Air Station Rockaway hangar fire of 31 August 1921 along with two small dirigibles, the C-10 and the H-1 and the kite balloon A-P. The last operational D-type, the D-3 was decommissioned by the Army sometime in 1924. Operators United States Navy United States Army Specifications (typical) See also List of airships of the United States Navy References 1920s United States patrol aircraft Airships of the United States Navy Goodyear aircraft