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"In May 1977 the American national security community was startled by a report in the respected trade journal Aviation Week & Space Technology concerning Soviet progress in directed energy weapons. For several years Major General George J. Keegan, head of Air Force intelligence, had been monitoring Soviet developments since 1973, and attempting since 1975 to convince the American military and intelligence community of an impending directed energy weapons gap. With his retirement in January 1977, he went public with his case."

Alternative explanation: https://spp.fas.org/eprint/keegan.htm