The Air Force's unmanned aircraft, X-37B, landed successfully Sunday morning at NASA's Kennedy Space Center -- but it didn't come down quietly.
원문출처 : http://www.cnn.com/2017/05/07/us/air-force-x-37b-landing-trnd/index.html
원문출처 : http://www.cnn.com/2017/05/07/us/air-force-x-37b-landing-trnd/index.html