Northrop Grumman B-2 Spirit air crews in the United States Air Force are well-known for flying some of history's longest missions. B-2 Spirit Bomber allows the aircrew to share workload on long cruises that take dozens of hours , keeping their alertness as high as possible. small read more Why The B-2 Spirit Remains Critical To US Defense Northrop Gumman’s B-2 Spirit has unmatched stealth, power, and global reach that make it an irreplaceable asset in US defense strategy. The US’ B-2 stealth bomber is an awesome warplane, but how many are there? The US Air Force designed the B-2 Spirit for the worst-case missions in the Cold War arms race.