By the way, in 1967 the USA ratified the Outer Space Treaty of 1967.
Article II of the treaty states, "Outer space, including the moon and other celestial bodies, is not subject to national appropriation by claim of sovereignty, by means of use or occupation, or by any other means."
In short, the USA doesn't own the Moon.
Article IV of the treaty states the following:
"States Parties to the Treaty undertake not to place in orbit around the earth any objects carrying nuclear weapons or any other kinds of weapons of mass destruction, install such weapons on celestial bodies, or station such weapons in outer space in any other manner. The moon and other celestial bodies shall be used by all States Parties to the Treaty exclusively for peaceful purposes. The establishment of military bases, installations and fortifications, the testing of any type of weapons and the conduct of military manoeuvres on celestial bodies shall be forbidden."
China and Russia both signed onto the treaty. So, who is supposed to shoot at the USA from the Moon?