RM-81 Agena
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The RM-81 Agena was an American rocket upper stage and satellite bus which was developed by Lockheed Corporation initially for the canceled WS-117L reconnaissance satellite program. Wikipedia
Diameter: 60 inches (1.5 m)
First flight: 1959
Last flight: February 12, 1987
Maximum thrust: 16,000 pounds-force (71 kN)
Powered by: One Bell XLR-81
Propellant: UDMH/Red fuming nitric acid
Total launches: 365