FBI and CIA heads are relatively new positions. DNI even more so.
I'm surprised an AG never was, though.
Edit: we both forgot Petraeus, pled guilty to doing a Clinton during his time as director at CIA.
(Doing several Clintons: extramarital affair, mishandling classified info. But not real estate fraud, witness tampering, money laundering, withholding information from Congress, or voter fraud. Hell of a world we're in when "doing a Clinton" isn't specific enough. )