"...will gradually replace aging B-1 Lancer and B-2 Spirit b

https://www.af.mil/News/Article-Display/Article/3235250/b-21-raider-makes-public-debut-will-become-backbone-of-air-forces-bomber-fleet/#:~:text=The%20B%2D21%20is%20designed,Spirit%20bombers%20now%20in%20service.

 The B-21 is designed to be a more capable and adaptable, state-of-the-art aircraft that will gradually replace aging B-1 Lancer and B-2 Spirit bombers now in service.

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• 在不掌握绝对制空权的情况下依赖空中加油是颇有风险的，如攻击完毕要返航时加油机被击落了或是不能起飞，B2还可自己飞回去， -天青水蓝- ♂ (1158 bytes) () 12/03/2022 postreply 00:48:21