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George Knapp Releases 5th DIRD (Defense Intelligence Reference Document)

George Knapp has released the fifth DIRD (Defense Intelligence Reference Document), which covers detection of hypersonic vehicles.

https://silvarecord.com/2019/08/01/5th-aawsap-d-i-r-d-released-by-george-knapp-covers-detection-of-hypersonic-vehicles/

(Photo courtesy of Silva Record)

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Written by Gail Shirk

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