The U.S. Air Force announced in May that the B-52 Commercial Engine Replacement Program completed its Critical Design Review, clearing Boeing to begin converting the first two B-52H bombers into the upgraded B-52J configuration later this year. Rolls-Royce will supply eight F-130 engines per aircraft to replace the Pratt and Whitney TF-33s that have powered the bomber since the Cold War. The Air Force has warned the TF-33 becomes unsustainable b…