Thor was one of the US’s first launch vehicles, it launched the first spacecraft for NASA and hundreds of Spy Satellites for the US Military. It would become the Delta, and also the most launched rocket in US history, but it started out as a humble ballistic missile which didn’t even have the range to hit targets in the USSR without being stationed on its doorstep. A lot of this history is thanks to the work of Ed Kyle, sadly his website no longer exists but the wayback machine has the all important Thor/D