the United States by Packard as the Packard Merlin. In addition to the British making use of American planes the US also made use of some Supermarine Spitfires both in escorting USAAF 8th Air Force bombers in Europe as well as being the primary fighter of the 12th Air Force in North Africa. In addition Bristol Beaufighter served as night fighters in the Mediterranean, and two squadrons of de Havilland Mosquito equipped the 8th Air Force as its primary photo reconnaissance and chaff deployment aircraft. The United States supplied several aircraft types to both the Royal Navy and RAF - all three of the U.S. Navy's primary fighters during the war years, the Wildcat, Corsair (with the RN assisting the Americans with preparing the Corsair for U.S. naval carrier service by 1944), and Hellcat also served with the RN's Fleet Air Arm, with the Royal Air Force using a wide range of USAAF types. A wide range of American aircraft designs also went to the Soviet Union's VVS air arm through Lend-Lease, primarily fighters like the P-39 and P-63 used for aerial combat, along with attack and medium bombers like the A-20 and the B-25 being among the more prominent types, both bombers being well suited to the type of lower-altitude strike missions the Soviets had as a top priority. Radar The British demonstrated the cavity magnetron to the Americans at RCA, Bell Labs. It was 100 times as powerful than anything they had seen and enabled the development of airborne radar. Nuclear weapons In 1942, and with the threat of invasion by Germany still apparent, the United Kingdom dispatched around 20 British scientists and technical staff to America, along with their work, which had been carried out under the codename Tube Alloys, to prevent the potential for vital information falling into enemy hands. The scientists joined the Manhattan Project at Los Alamos, New Mexico, where their work on uranium enrichment was instrumental in jump-starting the project. In addition Britain, was vital in sourcing raw materials for the project, both as the only source in the world of Nickel Powder required to build gaseous diffusers and providing Uranium both from its mine in British Congo as well as contracting a secondary supply from Sweden. Code-breaking technology Considerable information was transmitted from the UK to the US during and after WWII relating to code-breaking methods, the codes themselves, cryptoanalyst visits, mechanical