signal. They reported this as a Doppler-beat interference with potential for detecting the passing of a vessel, but it was not pursued. In 1930, Lawrence A. Hyland. working for Taylor at the Naval Research Laboratory (NRL) noted the same effect from a passing airplane. This was officially reported by Taylor. Hyland, Taylor, and Young were granted a patent (U.S. No. 1981884, 1934) for a "System for detecting objects by radio". It was recognized that detection also needed range measurement, and funding was provided for a pulsed transmitter. This was assigned to a team led by Robert M. Page, and in December 1934, a breadboard apparatus successfully detected an aircraft at a range of one mile. The Navy, however, ignored further development, and it was not until January 1939, that their first prototype system, the 200-MHz (1.5-m) XAF, was tested at sea. The Navy coined the acronym RAdio Detection And Ranging (RADAR), and in late 1940, ordered this to be exclusively used. Taylor's 1930 report had been passed on to the U.S. Army's Signal Corps Laboratories (SCL). Here, William R. Blair had projects underway in detecting aircraft from thermal radiation and sound ranging, and started a project in Doppler-beat detection. Following Page's success with pulse-transmission, the SCL soon followed in this area. In 1936, Paul E. Watson developed a pulsed system that on December 14 detected aircraft flying in New York City airspace at ranges up to seven miles. By 1938, this had evolved into the Army's first Radio Position Finding (RPF) set, designated SCR-268, Signal Corps Radio, to disguise the technology. It operated at 200 MHz 1.5 m, with 7-kW peak power. The received signal was used to direct a searchlight. In Europe, the war with Germany had depleted the United Kingdom of resources. It was decided to give the UK's technical advances to the United States in exchange for access to related American secrets and manufacturing capabilities. In September 1940, the Tizard Mission began. When the exchange began, the British were surprised to learn of the development of the U.S. Navy's pulse radar system, the CXAM, which was found to be very similar in capability to their Chain Home technology. Although the U.S. had developed pulsed radar independently of the British, there were serious weaknesses in America's efforts, especially the lack of integration of radar into a unified air defense system. Here, the British were without peer. The result