Braun's conditional release and Albert Speer, Reichsminister for Munitions and War Production, persuaded Hitler to reinstate von Braun so that the V-2 program could continue or turn into a "V-4 program" (the Rheinbote as a short range ballistic rocket) which in their view would be impossible without von Braun's leadership. In his memoirs, Speer states Hitler had finally conceded that von Braun was to be "protected from all prosecution as long as he is indispensable, difficult though the general consequences arising from the situation." Upon investigation by the United States Federal Bureau of Investigation on 1 May 1961 advised that “there was no record of an arrest in their respective files” suggesting that Von Braun's imprisonment was wiped from German prison records at a point after his conditional release or after the Nazi regime had fallen. Surrender to the Americans The Soviet Army was about from Peenemünde in early 1945 when von Braun assembled his planning staff and asked them to decide how and to whom they should surrender. Unwilling to go to the Soviets, von Braun and his staff decided to try to surrender to the Americans. Kammler had ordered relocation of his team to central Germany; however, a conflicting order from an army chief ordered them to join the army and fight. Deciding that Kammler's order was their best bet to defect to the Americans, von Braun fabricated documents and transported 500 of his affiliates to the area around Mittelwerk, where they resumed their work in Bleicherode and surrounding towns after the middle of February 1945. For fear of their documents being destroyed by the SS, von Braun ordered the blueprints to be hidden in an abandoned iron mine in the Harz mountain range near Goslar. The US Counterintelligence Corps managed to unveil the location after lengthy interrogations of von Braun, Walter Dornberger, Bernhard Tessmann and Dieter Huzel and recovered 14 tons of V-2 documents by 15 May 1945, from the British Occupation Zone. While on an official trip in March, von Braun suffered a complicated fracture of his left arm and shoulder in a car accident after his driver fell asleep at the wheel. His injuries were serious, but he insisted that his arm be set in a cast so he could leave the hospital. Due to this neglect of the injury he had to be hospitalized again a month later when his bones had to be