The B-52 marked the 70th anniversary of its first flight two years, and in April 2023 the US Air Force allocated the designation B-52J to the scheme to have the B-52H fleet re-engined with the F130 turbofan (which means the engine nacelles will be fitted with eight F130s, two per nacelle) and fitted with new modern radar, improved avionics, the AGM-181 cruise missile, communication upgrades, new digital displays replacing old analog dials, new wheels and brakes, and other improvements. How many B-52Hs will be converted to B-52J configuration is unclear, because the B-52H fleet is over 60 years old and there are less than 75 of them in service.

https://www.airandspaceforces.com/re-engined-b-52-b-52j/

https://www.defensenews.com/air/2024/02/12/the-new-b-52-how-the-air-for…