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The U.S. Air Force has awarded Boeing Defense Systems a $2 billion contract to modernize its B-52H fleet, which includes replacing engines and support systems for two aircraft. This initiative aims to extend the operational life of the 76 B-52s, some over 60 years old, until at least 2050, and is part of a broader strategy to transition to upgraded B-52Js and Northrop Grumman B-21 Raiders while retiring older B-2 Spirit and B-1 Lancer bombers in the 2030s.