Delta G

The Delta G, or Thor-Delta G was an American expendable [launch system] used to launch two biological research satellites in 1966 and 1967. It was a member of the Delta family of rockets.
The Delta G was a two-stage derivative of the Delta E. The first stage was a Thor missile in the DSV-2C configuration and the second stage was a Delta E. Three Castor-1 solid rocket boosters were clustered around the first stage. The solid-fuel upper stage used on the Delta E was not used on the Delta G.
Both launches occurred from Cape [Canaveral Air Force Station] Cape Canaveral Air Force [Station Launch Complex 17|Launch Complex 17]. The first was from pad 17A on 14 December 1966 at 19:20 GMT, with Biosatellite 1. At 22:04 on 7 September 1967, Biosatellite 2 was launched from pad B on the second Delta G.