A drone crashing onto the White House grounds on Monday raises troubling questions that terrorists could use armed drones to attack the U.S., writes Peter Bergen.
원문출처 : http://edition.cnn.com/2015/01/26/opinion/bergen-drones-future/index.html?eref=edition
원문출처 : http://edition.cnn.com/2015/01/26/opinion/bergen-drones-future/index.html?eref=edition