Von Braun was briefly detained at the "Dustbin" interrogation center at Kransberg Castle, where the elite of the Third Reich's economic, scientific and technological sectors were debriefed by U.S. and British intelligence officials. Initially, he was recruited to the U.S. under a program called Operation Overcast, subsequently known as Operation Paperclip. There is evidence, however, that British intelligence and scientists were the first to interview him in depth, eager to gain information that they knew U.S. officials would deny them. The team included the young L.S. Snell, then the leading British rocket engineer, later chief designer of Rolls-Royce Limited and inventor of the Concorde's engines. The specific information the British gleaned remained top secret, both from the Americans and from the other allies.