Delta C
The first stage was a Thor missile in the DSV-2A configuration, and the second stage was the Delta D, which was derived from the earlier Delta. The baseline Delta C used an Altair-2 third stage, whilst the Delta C1 had an FW-4D third stage, which provided a higher payload capacity than the Altair. It is unclear whether two or three launches were made using the C1 configuration.
Missions: 13
Successes: 11
Partial Failures: 1
Failures: 1
Success Streak: 5
Success Rate: 88.5%