Thor SLV-2 Agena BSLV-2 Agena B

Manufacturer: McDonnell Douglas · Maiden flight: 25 January 1964 · Wikipedia (opens in new tab)

Thor-Agena was a series of orbital launch vehicles. The rockets used Thor first stages and Agena second stages. They are thus cousins of the more-famous Thor-Deltas, which founded the Delta rocket family.