It involves alcohol, "improper relationships" with Navy women, or some combination thereof.
A good bet. Second choice is that he said something "politically incorrect."
I was in a unit where the C.O. (politely, ever so politely, no cuss words) suggested that perhaps the problems of one of his WM officers had been caused because she just may have been less than a saint (sexually).
She went crying to DACOWITS. He disappeared a few days later. No change of command ceremony. No reading of the orders.
He disappeared, like one of Stalin's victims.