Arnold selected Lieutenant Colonel Paul Tibbets, an officer with a distinguished combat record in Europe and North Africa, who had expert knowledge of the B-29 as one of its test pilots, to form and train a group to deliver atomic bombs. Tibbets chose the Wendover over Great Bend, Kansas, and Mountain Home, Idaho, as the location for his training program. It was remote, which was good for secrecy and security, but within reasonable distance by air from the Manhattan Project's Site Y, at Los Alamos, New Mexico, and the Naval Auxiliary Air Station Salton Sea, where bombing tables for the mission would be prepared. The base was given the code name "Kingman", and became the Manhattan Project's Site K. The activity to assemble, modify and flight test prototype bombs was named "Project W-47".