“A Q clearance is a DOE thing. My Dad has one. Therefore, if, as claimed, this Q has a Q clearance, he cannot be an “intelligence officer”.”
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Are you saying that intelligence officers cannot have a Q clearance?
If their work has to do with foreign nuclear technology issues then they can get a Q clearance. DOE Intel & CI division have Intel officers who specialize on nuclear issues.
Why would an intelligence officer have a Q clearance? He or she is not working for DOE. If he or she has the required NSA clearance and a need to know, that officer can access DOE materials requiring a Q clearance.