The community began a steady growth spurt in the 1930s, starting with construction of Muroc Air Force Base (renamed to Edwards AFB), site of frequent flight tests, including the "breaking" of the sound barrier by Chuck Yeager in a Bell X-1A in 1947. From the 1980s through the end of the program, Edwards AFB hosted a limited number of landings of the Space Shuttle. The development of Air Force Plant 42 in 1958, augmented in the 1960s by construction of Lockheed Aircraft's Plant 10, created tens of thousands of jobs. High-wage employment hit its peak in the 1970s during the Lockheed L-1011 commercial wide body jetliner project, for which all assembly and some engineering and parts production were performed. 250 L-1011 aircraft were assembled and flown from this plant and airfield. Lancaster was an unincorporated community in Los Angeles County until 1977, when it was incorporated as a city, with Arnold Rodio serving as its first mayor.