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In page 21st Space Wing:

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21st TFW aircraft intercepted Soviet Tupolev Tu-16 "Badger" and Myasishchev M-4 "Bison" bombers on a regular basis, taking home, in the words of Intelligence analysts, "some of the best photographs ever taken of the Badger". In October 1959, First Lieutenant Charles L. Ferguson of the 531st received credit for making the first M-4 Bison intercept in the Far East and probably the world.[1]