To the whole discussion of trauma must be added the complex trauma. It seems to be a fact that those most traumatized by war–or anything else–were already traumatized. People who start with emotional problems find them exacerbated by war.
Many vets who are alcoholics started out that way.
Life being what it is, shit can be additive. Things can get stuck on other things. This is what Stan Grof calls Condensed Experience, or CoEx, and what I call a Resonant Constellation.
Unresolved childhood grief can get aggregated with lost comrades in arms. Unresolved childhood terror can get added to battlefield terror.
So therapy for battle induced PTSD may also need to include therapy for other things as well. The same logic applies though: what works for the one, will work for the other.
Stay in the fight. Success is inevitable over some time domain.