While some of these weapon and sensor systems like the Electromagnetic Railgun or the FreeElectronLaser are at least a decade away, the Laser Weapon System and Air and Missile Defense Radar systems are almost ready for prime time deployment today.
The US Navy's free-electron laser has broken a few records already, but it's just plowed through another fairly big one -- one that its creators say could put it on the fast track to actually being used to shoot down missiles.