I think he was a Spec 4 or buck Sgt at the time. He was my platoon sergeant in 1979.
He must have been a real stud. Most Pentagon secretaries held out for at least a Major. A friend Cavalry Squadron Commander divorced his first wife and married the sweetie in his Pentagon office. Her first experience with the real Army was as the Wife of the Squadron Commander. Later, when he was a two-star, he dumped her for a CNN babe. She called me to cry on my shoulder. I asked her what she expected, she had done the same thing the last time around.