It’s important to understand that in the late 1940s within the United States there were three concurrent programs for military rocket development. This was due to continuing inter-service rivalry between the Army, Navy, and Air Force.
“In 1937, I was officially demanded to join the National Socialist Party. At this time I was already Technical Director at the Army Rocket Center at Peenemünde. The technical work carried out there had, in the meantime, attracted more and more attention in higher levels. Thus, my refusal to join the party would have meant that I would have to abandon the work of my life. Therefore, I decided to join. My membership in the party did not involve any political activity.” Werner von Braun, 1947.
“We are the first to have given a rocket a speed of 3,300 mph. We have thus proved that it is quite possible to build piloted missiles or aircraft to fly at supersonic speeds. We did it with automatic control. Our rocket today reached a height of nearly 60 miles. We have invaded space; we have proved rocket propulsion practical for space travel.” Walter Dornberger