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.
“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