The sounds of gunfire and explosions can also be "triggers" for many. If one must see it, best to view it in the privacy of one's home with one or two supportive friends around and no alcohol, etc.
I know if it was not for the bad dreams my brother inlaw would love the movie it has been over 25 years since he was in the army. it is my sister that wont allow him to watch them because of him having a bad dream and accidentally awaking in fight mode with her in the bed. he once attacked her while asleep when they first got married. he is very ashamed of that the guy is best described as a gentle giant.
Have you seen it, yet? I went Tuesday evening.