Sierra Nevada Corporation secures $13B contract to upgrade USAF's E-4B "Doomsday" fleet with Survivable Airborne Operations Center, bolstering national defense capabilities.
US Navy Receives First Upgraded E-6B Doomsday Plane From Northrop Grumman techtimes.com - get the latest breaking news, showbiz & celebrity photos, sport news & rumours, viral videos and top stories from techtimes.com Daily Mail and Mail on Sunday newspapers.