People who perform their duties flawlessly can still develop PTSD.
True, but most people have enough self control and self discipline to get through it without crying on every-bodies sleeves.
Jimmy Stewart did not allow them to use his medals or wartime exploits to sell his movies. THAT is why it took awhile to get a part.
My dad is an example: 5 Air Medals and 2 DFCs from 11 mos flying F4s out of Da Nang, and he was never the same after he came home. Subtle but deep change.