 Hall became Assistant Chief, Non-Rotating Engine Branch, Power Plant Laboratory, Wright-Patterson Air Force Base, where he participated in the development of solid and liquid rocket power plants.In 1951, he was one of four people at Wright Air Development Center (WADC) who were instrumental in the initiation of Project MX-1593, the Atlas program.In 1954, Hall joined Western Development Division as Chief, Propulsion Development, where he was responsible for the programs leading to development of engines for the Atlas, Titan, and Thor missiles.