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ABL (AirBorne Laser) System tested at System integration Laboratory (SIL) -

The Boeing YAL-1 Airborne Laser (ABL) weapons system is a megawatt-class chemical oxygen iodine laser (COIL) mounted inside a modified Boeing 747-400F. It is primarily designed to destroy tactical ballistic missiles (TBMs), similar to the Scud, while in boost phase. The laser has been test fired in flight, though it wasn't being aimed at anything. The Airborne Laser aircraft was designated YAL-1A recently by the U.S. Department of Defense. A less powerful early flying prototype installed in a Boeing NKC-135A successfully shot down several missiles in the 1980s. It was called the Airborne Laser Laboratory, and was a technological pathfinder for the ABL.