a professor shortly thereafter. By that time, the British and Soviet intelligence agencies were aware of the rocket program and von Braun's team at Peenemünde, based on the intelligence provided by the Polish underground Home Army. Over the nights of 17–18 August 1943, RAF Bomber Command's Operation Hydra dispatched raids on the Peenemünde camp consisting of 596 aircraft, and dropped 1,800 tons of explosives. The facility was salvaged and most of the engineering team remained unharmed; however, the raids killed von Braun's engine designer Walter Thiel and Chief Engineer Walther, and the rocket program was delayed. The V-2 became the first artificial object to travel into space by crossing the Kármán line with the vertical launch of MW 18014 on 20 June 1944. The first combat A-4, renamed the V-2 (Vergeltungswaffe 2 "Retaliation/Vengeance Weapon 2") for propaganda purposes, was launched toward England on 7 September 1944, only 21 months after the project had been officially commissioned. Doug Millard of the Science Museum, London states: The V2 was a quantum leap of technological change. We got to the Moon using V2 technology but this was technology that was developed with massive resources, including some particularly grim ones. The V2 programme was hugely expensive in terms of lives, with the Nazis using slave labour to manufacture these rockets. Experiments with rocket aircraft During 1936, von Braun's rocketry team working at Kummersdorf investigated installing liquid-fuelled rockets in aircraft. Ernst Heinkel enthusiastically supported their efforts, supplying a He-72 and later two He-112s for the experiments. Later in 1936, Erich Warsitz was seconded by the RLM to von Braun and Heinkel, because he had been recognized as one of the most experienced test pilots of the time, and because he also had an extraordinary fund of technical knowledge. After he familiarized Warsitz with a test-stand run, showing him the corresponding apparatus in the aircraft, he asked: "Are you with us and will you test the rocket in the air? Then, Warsitz, you will be a famous man. And later we will fly to the Moon – with you at the helm!" In June 1937, at Neuhardenberg (a large field about east of Berlin, listed as a reserve airfield in the event of war), one of these latter aircraft was flown with its piston engine shut down during flight by Warsitz, at which time it was propelled by von Braun's rocket power alone. Despite a wheels-up