Lunar orbit
While designing the Gemini spacecraft in 1961, Chamberlin proposed that Gemini be paired with a "bug" that would land a single astronaut on the Moon. Chamberlin had been impressed with NASA engineer John Houbolt's advocacy of Lunar orbit rendezvous as the method to go to the Moon. Although Chamberlin's idea of flying Gemini to the Moon was rejected, it helped lead NASA to its decision in 1962 to use Lunar Orbit Rendezvous in the Apollo program, which involved using the Lunar Module (LM) to descend to the lunar surface.