that would allow the rocket to remain stable. He also worked on the Wasserfall rocket, a radar-guided supersonic anti-aircraft missile, in which the same center-of-pressure shift was being encountered. Along the way, he developed a conical rocket propellant tank that successfully overcame liquid fuel sloshing problems, for which he won an internal prize with a monetary award that he proudly never cashed. In August 1943, when Allied forces bombed the Peenemuende facilities, he received a commendation for saving critical wind tunnel data during the ensuing fires. The Wasserfall project continued almost to the war's end, and the rocket was successfully flown but never went into production. In 1944, he and others in the group were granted civilian status, and resumed the A9/A10 development effort. In January 1945, near the end of the war, two A9 test rockets were launched with control surface designs based on the group's solution to the center-of-pressure shift. The second of these achieved stable transition to supersonic flight. Facing advancing Russian forces at the beginning of February 1945, he and most others on the rocket team moved to Oberammergau to allow a surrender to American forces. After his release in August 1945, he briefly worked in a candle factory of family friends in Bonn, until accepting an invitation from the U.S. as part of Operation Paperclip to join the U.S. Army's nascent rocket program with other members selected from von Braun's team. He insisted, however, on first being allowed to finish his degree, which was officially awarded in mechanical engineering due to postwar restrictions on further rocket work in Germany. In August 1947 he rejoined the other scientists from the von Braun team at Fort Bliss, Texas to begin work on the U.S. rocket program. In the U.S. he was initially involved in tests at White Sands Missile Range using V2 rockets. These results led directly to the Redstone rocket and laid the basis for every other rocket developed in the United States since. The White Sands work included a Mach 3 cruise missile known as the Hermes II, based on a V2 first stage with a radical linear ramjet concept for the second stage. His work on the Hermes II continued after he moved in 1950 with much of the von Braun team to Huntsville, Ala. as part of the Army's ballistic missile program. There he developed the external aerodynamic design for the Army's Redstone