of other companies' designs. At the start of the war Hughes Aircraft had only four full-time employees—by the end the number was 80,000. During the war, the company was awarded contracts to build B-25 struts, centrifugal cannons, and machine gun feed chutes. Post–World War II Hughes Aircraft was one of many aerospace and defense companies which flourished in Southern California during and after World War II and was at one time the largest employer in the area. Yet, employment had dropped to 800 by 1947. By the summer of 1947 certain politicians had become concerned about Hughes' alleged mismanagement of the Spruce Goose and the XF-11 photo reconnaissance plane project. They formed a special committee to investigate Hughes which culminated in a much-followed Senate investigation, one of the first to be televised to the public. Despite a highly critical committee report, Hughes was cleared. The company then expanded into the booming electronics field, eventually employing 3,300 Ph.D.s. Hughes hired Ira Eaker, Harold L. George, and Tex Thornton to run the company. By 1953, the company employed 17,000 and had $600,000,000 in government contracts. In 1948 Hughes created a new division of the company, the Aerospace Group. Two Hughes engineers, Simon Ramo and Dean Wooldridge, had new ideas on the packaging of electronics to make complete fire control systems. Their MA-1 system combined signals from the aircraft's radar with a digital computer to automatically guide the interceptor aircraft into the proper position for firing missiles. At the same time other teams were working with the newly formed US Air Force on air-to-air missiles, delivering the AIM-4 Falcon, then known as the F-98. The MA-1/Falcon package, with several upgrades, was the primary interceptor weapon system of the USAF for many years, lasting into the 1980s. Ramo and Wooldridge, having failed to reach an agreement with Howard Hughes regarding management problems, resigned in September 1953 and founded the Ramo-Wooldridge Corporation, later to join Thompson Products to form the Thompson-Ramo-Wooldridge based in Canoga Park, with Hughes leasing space for nuclear research programs (present day West Hills (Canoga Park)). The company became TRW in 1965, another aerospace company and a major competitor to Hughes Aircraft. In 1951 Hughes Aircraft Co. built a missile plant in Tucson, Arizona. The construction of this plant, wrote David Leighton, in the Arizona Daily Star newspaper, was due to "Howard Hughes’ long-held fear that his plant in Culver City, California,