The Air Force intends the B-21 to replace the Rockwell B-1 Lancer and Northrop Grumman B-2 Spirit by 2040, and possibly the Boeing B-52 Stratofortress after that. The Air Force began planning for the B-21 in 2011 and awarded the major development contract in 2015. The B-21 made its first flight on 10 November 2023.
Spirit uncovered strong evidence that Mars was once much wetter than it is now. Described as a "wonderful workhorse"—Spirit operated for 6 years, 2 months, and 19 days, more than 25 times its original intended lifetime. The rover traveled 4.8 miles (7.73 kilometers) across the Martian plains. On May 25, 2011, NASA ended efforts to contact the
9. @MadhavSudarshan there are most probably zero-zero ejection seats and the upper escape panels above the cockpit might be able to jettison on their own. – Thunderstrike. May 30, 2015 at 9:17. 3. @MikeFoxtrot - there are indeed ejection seats, as the only loss of a B-2 did not involve the pilots - they ejected safely.
The B-2 is also certified to carry long-range AGM-154 JSOW glide bombs (80 miles) and AGM-158 JASSM stealth cruise missiles (230 to 575 miles) to allow it to deliver standoff attacks without
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