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Sources

https://www.popularmechanics.com/military/aviation/a19133400/b-21-stealth-bomber-testing-edwards-afb/?src=nl&mag=pop&list=nl_pnl_news&date=030718

https://www.ebay.co.uk/itm/B-21-Raider-Stealth-Bomber-Combined-Test-Force-Patch/202269436200?hash=item2f1832a928:g:whwAAOSwgc1arpa2

http://www.thedrive.com/the-war-zone/14919/the-b-21s-three-decade-old-shape-hints-at-new-high-altitude-capabilities

https://www.stripes.com/news/air-force/air-force-seeks-10-billion-budget-boost-to-increase-force-size-invest-in-future-weapons-1.572323

https://nationalinterest.org/blog/buzz/stealth-suprise-us-air-force-builds-first-b-21-raider-test-bomber-66131