\<COLOUR 1> PROPELLANTS: \<COLOUR 0> First stage, kerosene/liquid oxygen; second stage, UDMH/nitric acid
\<COLOUR 1> PAYLOAD: \<COLOUR 0> Discoverer military satellites
\<COLOUR 1> LAUNCH SITE: \<COLOUR 0> Vandenberg Air Force Vase, California
\<COLOUR 1> COUNTRY: \<COLOUR 0> USA
\<COLOUR 1> COMMENTS: \<COLOUR 0> Developed from the Thor IRBM (intermediate range ballistic missile); first launch on February 28, 1959, is also the first orbital launch from Vandenberg; Thor- Agena B and D are similar, but with increased lift-off thrust (78 tonnes).