`` Project Horizon '' proposed a leap beyond the Soviets in the space race . The United States would send astronauts to orbit, and then land them on Mars or other planets with robotic probes that could explore for life. The security archive said that Air Force leaders scrapped the idea after deciding that it was too risky . The military outpost was to have bulldozers , cabins , nuclear power plants .
`` Project Horizon '' proposed a leap beyond the Soviets in the space race . The United States would send astronauts to orbit, and then land them on Mars or other planets with robotic probes that could explore for life. The military outpost was to have bulldozers , cabins , nuclear power plants .