He did an interview on Bloomberg where the hosts ask and press him on "Did you ever kill anyone?" (the one question that you're never supposed to ask veterans, and presumably, intel agents). He implies, but doesn't say, that he did.
I just don't like it when people admire what was shown in this TV series. (yes, I felt it was cool back then, but I've realised sine then that this series really just indoctrinated me to accept torture)