The birthplace of PTSD is not only the events that soldiers experience; it is the lack of ability to UNDERSTAND the events AFTER they have occurred. There is no going back, so it is extremely difficult to rationalize an event they had little control over after it has already occurred. Proper training prior to active duty should absolutely include as much time for justifying/rationalizing/explaining what they will experience, as it includes time for the "how". i.e. Part I: How to engage the target efficiently (time/accuracy)when the target pops up. Part II: Why it is morally honorable to engage this target and what your body/mind will do afterward (physiologically and psychologically) over a set time line.
This way the soldier had a "say" in what has happened allowing the brain to rationalize the decision, along with what to expect next. PTSD would drop significantly.