A U.S. Coast Guard Martin 4-0-4 in flight (s/n 1283). Two aircraft were acquired in 1952 and designated RM-1 (USCG serials 1282/1283). They were later upgraded to RM-1Z VIP transports (re-designated VC-3A in 1962). Both were stationed at the Washington National Airport and used by the Commandant of the USCG and the Secretary of Treasury/Transportation. Both were turned over to the U.S. Navy in 1969 (BuNos 158202/158203) and used until 1971. Later, they were sold to civil operators. 1282 crashed in Venezela in 1978, 1283 was written off in 1974.
USCG
USCG photo in <a rel="nofollow" class="external text" href="http://www.uscg.mil/history/webaircraft/CGAviationHistory1939_1956.pdf">A History of Coast Guard Aviation: The Growth Years (1939-1956)</a> p. 158.