In a test, the 747-based Airborne Laser shot down a tactical liquid fuel missile. The day before they tried the same thing on a solid fuel missile, but the laser stopped before the missile was actually destroyed (maybe running out of COIL laser fuel). This is probably the swan song of the system, which has proven very problematic, ruinously expensive, and still not anywhere close to having the range to actually be useful. Gates has already gutted the program, reducing the number of planes to the one already flying and now treating it as only a research program. http://www.aviationweek.com/aw/blog...&plckScript=blogScript&plckElementId=blogDest
I would expect that some other systems designed to detect & neutralize these weapons at their deployment sources exist or are still in design mode.
We already have weapons for taking out missiles just about to deploy. They are strike aircraft and long range missiles.