• 55-3320 United States Army. Delivered 19-Dec-1956. Designated U-1A.
Loaned by the Army to the US Marine Corps at Marine Corps Air Station Quantico, VA.
Unknown date: Assigned to the 353rd Engineer Group at Oklahoma City, an Army Reserve unit.
Dec-1965. Assigned to the New Cumberland Army Depot, Harrisburg, Pennsylvania as a support aircraft.
November 1967. Sharpe Army Depot, Stockton, CA, from where it was transported to Vietnam.
May-1968, 54th Aviation Company, Vung Tau, Vietnam until stood down in Jan-1971.
Feb-1971. 388th Transportation Company, Vung Tau, Vietnam which was responsible for the storage and disposal of all Army Otters in Vietnam.
Jul-1971. Struck off US Army inventory as scrapped.