Some of that has always been true.
My father graduated from Annapolis in 1948 and spent the next six years in the U.S. Navy. During the Korean War he served in a U.D.T. Team (a sort of precursor to U.S. Navy SEALs) and for one year after the end of the war, in the Submarine Service. He resigned his commission in 1954 when he decided to marry my mother, since he didn't believe married life was compatible with military service (this was HIS OPINION and reflects only how he felt about this; we all know other servicemen who have had successful marriages and careers).
He did remarkably well in his civilian career. A testament to his drive, ambition, and also IMHO the education he received at Annapolis.
He didn't much like discussing his Korean War experience, but during the Vietnam war there were news reports on TV that would provoke him as he felt they were based on ignorance of war and were unfair, and he'd sometimes relate a wartime exprience to illustrate his point.
As a young child I was of course very curious about his wartime experience ... but I learned also that he didn't want to talk much about it so I learned to respect that.