 There was a number of proposals for space access systems in the 1970s also, such as the Rockwell "Star-raker" Star-raker was a large single-stage to orbit design that used both rockets and ramjet for propulsion.It was a contemporary to the Boeing "Reusable Aerodynamic Space Vehicle", which an all-rocket propulsion single-stage to orbit design.Some programs from the early 1980s were the "Future Space Transportation System" program and the later NASA "Advanced Manned Launch System" program.