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Zero

What type aircraft

https://www.af.mil/About-Us/Fact-Sheets/Display/Article/104504/e-3-sentry-awacs/

I wonder why they don't put some newer engines on this like they did to the KC135's, basically the same plane.

The original engines on the KC-135 were J57 engines but eventually the AF changed to fan-jets on all of them. I think the same applies to the B-52.