11.   Critics of the airborne laser have questioned whether it would be too vulnerable to enemy anti-aircraft missiles.

12.   The administration also is exploring the feasibility of other missile defense weaponry, including an airborne laser, ship-based missile interceptors and space-based weapons.

13.   The Air Force is working on such a system, which it calls the airborne laser, and some believe Bush will give it an infusion of money.

14.   The Air Force is working on such a system, which it calls the airborne laser.

15.   The airborne laser is among several laser technologies the Bush administration is developing in pursuit of a missile defense system with global reach.

16.   Actual deployment of the shield -- which also is to include sea-based missiles, airborne lasers and space-based killer satellites -- is years away.