Originally Posted by
treadigraph
The E-8s have JT-8Ds upgraded from JT-3Ds.
I'm not so sure how far that plan has progressed. Certainly some JSTARS appear to be still flying around with JT3Ds:
https://www.airplane-pictures.net/ph...c-joint-stars/
Though at least one has definitely had the upgrade:
https://photofinder.tdbtools.com/pho...fb-5-sept-2013