Supporters of the Pentagon's planned missile defense system say that eventually it will be able to stop almost any type of missile, in any stage of flight. Cabbage's investigation found that those claims are still a long way from being realized. While some of the basic technology has been developed, the system still needs extensive testing and a lot of refinement. The military's current tests are not challenging enough; they're really just used to make it seem as if the technology is progressing. Partisan politics also have a part in the slow development of the technology and the lack of appropriate testing.