• 55-3300 United States Army. Delivered 21-Sep-1956. Designated as U-1A.
Initially assigned to the 2nd Aviation Company, Fort Riley, KS.
Aug/Sep 1957 to Brookley AFB., Mobile, AL. Here the aircraft was loaded on board a ship serving with the Military Sea Transportation Service, which set sail for Bremerhaven, Germany arriving later in 1957.
2nd Aviation Company based at Illesheim, Germany until Jul-1959 when the unit moved to France.
July 1963 it joined the 2nd Aviation Company in France It is understood this aircraft was based at Orléans until disbanded.
Mar-1967. 56th Aviation Detachment, based at Coleman Barracks, Mannheim, Germany, which took over the duties which the 2nd Aviation Company had performed
In October 1967 the Otter was transported from Coleman Barracks to the United States.
Mar-1968. 54th Aviation Company, at Long Thanh North Vietnam. It was to serve with this unit for the next three years until stood down in Jan-1071
Jan-1971. To the 56th Transportation Company, for disposal.
Feb-1971. To the 388th Transportation Company, Vung Tau, responsible for the storage and disposal of all US Army Otters in Vietnam
• 53300 (Assumed serial) Government of Cambodia during 1971 for the Khmer Air Force.
Reported as a combat loss on 13-Nov-1971 and not flyable in Jul-1973. Probably withdrawn from use and ultimately presumed as scrapped.