For once Bush is doing something good for science instead of completely ignoring it! Way to go Bush! I would love to see a landing on Mars, that would be a great achievment for our lifetime.
Bush withdrew the USA from the Ballistic Missle Treaty, "Start 1", last year over protests from Russia. The USA is free to use nukes to our hearts desire.
I believe that Bush withdrew from the ABM Treaty, which is the Anti-Ballistic Missile Treaty. That means we are free to develop missile defense systems, not use nukes to our hearts desire.