The U.S. Air Force has announced that the B-21 Raider will replace B-1 Lancer and B-2 Spirit aircraft at three existing bomber bases beginning in the mid-2020s. The Air Force selected Dyess Air Force Base, Texas; Ellsworth AFB, South Dakota; and Whiteman AFB, Missouri, as reasonable alternatives to host the new B-21 aircraft. Barksdale AFB, Louisiana, and Minot AFB, North Dakota, will continue to host the B-52, which is expected to continue conducting operations through 2050. Although the first B-21 is expected in the mid-2020s, the Air Force doesn't plan to retire the existing bombers until there are sufficient B-21s to replace them. For more details, see this Military.com article.