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In page Strategic Defense Initiative:

"

Ashton Carter, then a board member at MIT, assessed SDI for Congress in 1984, noting difficulties in creating an adequate missile defense shield, with or without lasers. Carter said X-rays had a limited scope because they become diffused by the atmosphere, much like the beam of a flashlight spreading outward in all directions. This means the X-ray sources needed to be close to the Soviet Union, especially during the boost phase, for the Soviet missiles to be both detectable to radar and targeted by the lasers. Opponents disagreed, saying advances in technology, such as using stronger beams, and by "bleaching" the column of air surrounding the laser beam, could increase the distance that the X-ray could travel to successfully hit its target.[citation needed]