I though he was still active, too. Musta missed that one, Haden served while still ADAF. Not necessarily a bar to testimony to have an IG investigation ongoing, but they’d have to recall him to AD in order to give him an order not to testify - and even that might not be a “lawful order”.
We’re in uncharted territory here, especially with this corrupt a POTUS and DOJ etc. Even Dempsey is a Quisling, and Panetta has disgraced himself for life with his insane Benghazi excuse that “The U.S. military doesn’t do risky missions.”