[Army Air Corps]

So... build a large magnetic catapult on the Moon. Build as many ship components as possible on the Moon, and catapult them into Lunar orbit for assembly. (A large magnetic brake and catapult could also stationed in Lunar Orbit. The surface catapult can also be used as a magnetic “brake” for incoming items needed on the Moon. This is a bit hairy, but probably much less so than landing a plane on an aircraft carrier!)

Railguns on the Moon - something that NASA has proposed since the 1980s.

[Paul R.]

Yup. Heinlein discussed it in 1966... “Throw rocks at them.” (2 kiloton blasts.)

One character (”Wyoh”) in “The Moon Is A Harsh Mistress” laments that Earth’s nuclear bombs are so much bigger. Mike (a sentient computer) points out that “Luna has MANY rocks”.