• 57-6141 US Army # 1798. L-20 No. 799. Command A-13. Delivered 13-May-1958. Built as L-20A and re-designated U-6A in 1962.
• 57-6141 Served with 224th Aviation Battalion & 156th Aviation Company (RR) at Can Tho in South Vietnam in 1966 as an RU-6A.
• 1225 Philippine Air Force / Hukbong Himppawid NG, Philipinas, Manila, Philippines
• RP-52 Philippine Air Force / Hukbong Himppawid NG, Philipinas, Manila, Philippines. Canx 1984.
Note: Reported as passes to civilian market possibly as RP-C52.