U.S. defense giant Northrop Grumman Corp. is set to unveil its future stealth bomber in December.The first B-21 Raider stealth bomber will be public reveal during the first week of December at the company’s Palmdale, California facility.The B-21 Raider unveiling will be a historic moment, providing an exclusive view of the B-21 aircraft.The Air Force also plans to acquire a new long-range fighter, known as Penetrating Counter-Air, which will accompany the B-21 Raider deep into enemy territory. The new fighter, of which little is known, will help the bomber defend against enemy air defenses.