The X-51A Waverider flew its fourth and final mission May 1 over the Point Mugu Naval Air Warfare Center Sea Range May 1, 2013,during which the test team achieved a record-setting 210 seconds of air-breathing hypersonic flight. Flight testers from Edwards Air Force Base, Cali., played a vital role in the program's success. Bobbi Zapka

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Keywords: .., air, airman, airmen, defense, force, military, united, war