It's rather splendid to think of all those great men and women who appear to have presented symptoms that allow us to describe them as bipolar. Whether it's Hemingway Van Gogh... Robert Schumann has been mentioned... Virginia Woolf Sylvia Plath... some of them with rather grim ends.
In the re-creation of combat situations and this is coming from a director who's never been in one being mindful of what these veterans have actually gone through you find that the biggest concern is that you don't look at war as a geopolitical endeavor.