PALMDALE, CA -- In a dramatic ceremony to showcase what officials called the "future backbone" of the Air Force's bomber fleet, Northrop Grumman revealed the B-21 Raider to the public for the first time Friday. The B-21 has advanced stealth capability and will be capable of long-range flights with a variety of payloads, including conventional and nuclear weapons, Defense Secretary Lloyd Austin said here during the ceremony at Air Force Plant 42. The open architecture design also allows updates or...