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A U.S. Air Force B-2 Spirit deployed from Whiteman Air Force Base, Mo., flies overhead after returning from a local training mission at Andersen Air Force Base, Guam, Jan. 12, 2017. The B-2's low-observable, or "stealth," characteristics give it the ability to penetrate an enemy's most sophisticated defenses and threaten heavily defended targets while avoiding adversary detection, tracking and engagement.