Ellsworth AFB slated for first main operational base for B-21 Raider in United States Secretary of the Air Force Public AffairsMarch 10, 2021Business U.S. Air Force courtesy graphic by Northrop GrummanShown is an artist rendering of a B-21 Raider concept in a hangar at Ellsworth Air Force Base, S.D. Ellsworth AFB is one of the bases expected to host the new airframe. ELLSWORTH AIR FORCE BASE, S.D. (AFNS) — The B-21 Raider program continues to progress through the engineering and manufacturing development acquisition phase. One visible example of progress was the recent construction and installation of a temporary prototype Environmental Protection Shelter at Ellsworth Air Force Base.