10 More Insanely Accurate War Movie Details

Lone Survivor is decidedly not the most accurate war film out there.

Peter Berg's war "biopic" takes numerous liberties with the actual events of Operation Red Wings. A reconnaissance mission during the war in Afghanistan, the operation claimed the lives of 19 American soldiers.

Featuring Mark Wahlberg as titular lead Marcus Luttrell, Lone Survivor is a riveting watch. However, it's hard to ignore the fact that moments like the epic climactic showdown, Luttrell's near beheading or his flatline and return from the dead simply didn't happen.

Fortunately, Berg redeems his historical bumbling with some of the more realistic gunfights in recent memory. This is highlighted by a minor moment as Luttrell prepares to fire the shot that sets the mountainside battle into motion.

Primed to shoot, the marksman can be seen very slightly shaking his head up and down. This innocuous action is used to establish parallax within the field of a magnified optic. This allows the shooter to check whether the scope's reticle and the target behind it are on the same focal plane - essentially, whether the sight lines up with the target.

A feature so microscopic, it would likely be missed by 99.9% of viewers. In this sense, it's technically totally unnecessary, underlining Berg's devotion to bringing the movie's combat scenes to life.