I read that there have been proposals to re-engine the fleet even when earlier models where still in use. Each time for budgetary reasons the Air Force chooses not to. The G and H where built with better engines which provided more power still they are 50's technology and much less fuel efficient than modern engines and even engines that where designed 30 years ago.
I'm betting that eventually they probably will at some point re-engine at least some of the H models. As not only would fuel efficiency increase but maintainace costs would improve as the older TF-33s require much more TLC than a more modern turbofan.
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