Yes of course, but who owns the moon? What laws would it follow? The odds of putting missles on the moon would potentially tip off WWIII. Lets face it.. most countries would put nukes on the moon if they had a base.

Perhaps, but consider the many tanks on these items. Likely several are a mixture of oxygen. If the air thins out at a point, then simply provide it yourself if needed. If you watched the launch it did not take very long, the supplies needed would not be so severe we couldn't provide them.

What need is there for a gas station when we have far better methods now of providing that? Such as using a slingshot of gravity. We have done so with several satellites.