So I’m not “Ex-Military Intelligence” even though I’ve done very little in that field since leaving the Army?
If you remain in service to whatever intel group to which you belonged, no, you’re not “ex.” You’d never be ex-CIA, either. No such thing as an ex-spook for any national intelligence agency, not in my opinion. GHW Bush in my opinion behaved rather oddly at times pertaining to certain matters, and I’m not alone in attributing that to his being an old spook.