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Gen. William Shelton, head of the U.S. Air Force Space Command,... News PhotoAir Force,Astronomy,Capitol Hill,Emergencies and Disasters,Emergency Planning,Law,Politics,Rayburn House Office Building,Science and Technology,Space Mission,Testimony,US Air Force,USA,Vertical,Waist Up,Washington DCPhotographer Collection: Getty Images News 2013 Getty ImagesWASHINGTON, DC - MARCH 19: Gen. William Shelton, head of the U.S. Air Force Space Command, testifies before the House Science, Space and Technology Committee in the Rayburn House Office Building on Capitol Hill March 19, 2013 in Washington, DC. The committee asked government and military experts about efforts to track and mitigate asteroids, meteors and other 'near Earth objects.' (Photo by Chip Somodevilla/Getty Images)