Heather Penney, an Air National Guard pilot and Lockheed Martin program director, briefs “Air Force STEM 2020 Challenge” winners on fifth-generation fighter technology at the Pentagon on April 20, 2012. Eighteen Air Force STEM 2020 Challenge essay contest winners from Virginia, Maryland and District of Columbia schools were invited to the Pentagon for a day of learning about innovation in the Department of Defense. (U.S. Air Force photo)
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