In the case of a recent DoD decision regarding the mental health of our service members, evem Churchill's old line about Americans understates our capacity for doing the wrong thing over and over again.
Moral injury is not PTSD. Moral injury has a slow burn quality that often takes time to sink in. To be morally injured requires a healthy brain that can experience empathy, create a coherent memory narrative, understand moral reasoning and evaluate behavior.
Human beings seem infinitely adaptable. But there is no silver bullet, no quick fix potion that will make a soldier, sailor, airman or Marine invulnerable to five, six or more tours of duty in today's war zone and the separations from loved ones.