The Thor-Delta also known as Delta DM-19 or just Delta was an early American expendable launch system used for 12 orbital launches in the early 1960s. A derivative of the Thor-Able it was a member of the Thor family of rockets and the first member of the Delta family.The first stage was a Thor missile in the DM-19 configuration. The second stage was the Delta which had been derived from the earlier Able stage.
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