180404-N-ZB537-0040 PATUXENT RIVER, Md. (April 4, 2018) Test pilot Billie Flynn pilots an F-35C Lightning II test aircraft during an external GBU-31 and AIM-9x buffet and flutter test flight from Naval Air Station Patuxent River, Md., April 4, 2018. (U.S. Navy photo courtesy of Lockheed Martin/Released)