• 53-3724 US Army #1414. L-20 No: 415. Delivered 23-Jul-1954. Built as L-20A and re-designated U-6A in 1962. Later re-designated RU-6A.
• 53-3724 Operated with 156th Aviation Company. (Radio Research) from Jun-1966. Can Tho Vietnam.
Accident: 5 mi. SE of Can Tho, Vietnam 24-Nov-1970. Destroyed in mid air collision with SVNAF UH-1H whilst serving with 156th Aviation Company(RR). Three fatalities. (10 fatalities in UH1-H)