Jesse Manes who is Alex Manes father is shown during the trailer scene as a Senior Master Sergeant in the Air Force. His Beret had an error where he should have an eagle. Though on his beret he has the marking of Major on it. He cannot be a Major as well as a Senior Master Sergeant.
During the bunker scene Jesse Manes and Kyle Valenti walk towards the bunker. Jesse Manes Uniform shows that he is now a Chief Master Sergeant. Also during this scene Kyle Valenti refers to Jesse Manes as Master Sergeant which is factually inaccurate.