Air Force Photos

Dr. David Walker, deputy assistant secretary of the Air Force for science, technology and engineering, prepares his notes prior to testifying on science and technology programs in the changing security environment before the House Armed Services Committee’s subcommittee on Intelligence, Emerging Threat and Capabilities, in Washington D.C., March 26, 2014. (U.S. Air Force photo/ Staff Sgt. Carlin Leslie)

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Photo by: Air Force Staff Sgt. Carlin Leslie |  VIRIN: 140326-F-QZ836-213.JPG