For the United States, the issue goes way beyond missile defense.
Several documents reveal the plans.
The multicolored cover of Vision for 2020 shows a weapon shooting a laser beam from space and zapping a target below. Integrating Space Forces into warfighting capabilities across the full spectrum of conflict. Now it is time to rule space. The emerging synergy of space superiority with land, sea, and air superiority will lead to Full Spectrum Dominance. The Air Force publishes similar pamph-lets.