A variety of production missiles and one off designs of post 1945 were conceptualized and speced for prototype before the US Army or Air Force shot its first war booty V2 or settled Braun into his US cottage.
it's an important point to make here that von Braun and company were brought to the US under essentially internment and kept in sub-standard quarters under armed guard and not allowed to leave without a guard detachment accompanying them. (And they were specifically not allowed to leave the base for any reason) Even when they were transferred to White Sands they were restricted to base and only allowed off base when accompanied by an armed guard.
The US was already ahead of the Germans in rocket research and were not at all impressed by the V1 or V2. They thought the V1 advantage of low cost and low technology could be useful in the invasion of Japan but no such plans were made for an Americanized "V2" until the Korean war broke out in the 1950 and the Redstone was essentially a copy of the V2 using US technology. Keep in mind that the original 'Plan" had been to keep the German scientist and engineers that were not recruited to private industry for about a decade and then let them go back to Germany once we were sure their knowledge was no longer useful to the Russians. It was never about using their knowledge or technology since the US already had better in most cases.
Randy