He also said, "Our destiny beyond the Earth is not only a matter of national identity but a matter of national security," and, "When it comes to defending America, it is not enough to merely have an American presence in space. We must have American dominance in space."
I'm not kidding. He really said all that.
That's right, the Outer Space Treaty.
The Outer Space Treaty was ratified in 1967 and has been signed by over 130 countries, including Russia, China and, of course, the United States. This treaty is the basis of international space law and basically forbids the mass weaponization of space or using celestial bodies such as the Moon or planets for any purposes other than peaceful pursuits beneficial to mankind.
"True," said Tom, "but just because it's against the law doesn't mean that some bad guys might not do it anyway."
(Sigh) Yeah. I just hope we don't end up being the bad guys.