How US is Secretly Upgrading its Feared B-52 Bombers to Fly for 100 Years General Leave a Comment on How US is Secretly Upgrading its Feared B-52 Bombers to Fly for 100 Years discover how the legendary B-52 Stratofortress continues to serve after 70 years, with new Rolls-Royce engines, advanced upgrades, and even hypersonic missile testing. (Visited 2 times, 2 visits today)