Secretary Dunlap is a character who makes a single appearance in the Season 3 episode Airwolf II (episode).
Zeus takes Secretary Dunlap to a test range to see a demo of the F.I.R.M.'s new helicopter which he says is probably the "finest single aircraft in the world". "As good as Airwolf?" the secretary asks. "Perhaps better," Zeus replies. The Secretary is skeptical. He tells Zeus that a half billion dollars of cost overrun and three years of development ought to buy that. But in the end, the Secretary is blown away by the performance of Redwolf. Grabbing the radio, he tells the test pilot Harlan "Tex" Jenkins that the test was superb. Jenkins replies that for Redwolf the test was routine. The pilot was superb.
The Secretary's department was never mentioned in the episode but considering that he oversess the F.I.R.M., it is most likely that he is the Secretary of Defense.