This is just my personal opinion, I just don't see how any of the people could have existed or most of the stories they did. Just a little fishy. You can add on to the list or rerank and make your own.
http://www.ranker.com/list/the-most-unrealistic-ranked-fictional-military-characters/stokified, armed forces, fictional characters, characters, Humor, military, army, other,
Jordan O'Neil (G.I. Jane)
A female Senator appoints a female Navy Lieutenant to go through BUDs (SEAL bootcamp.) For one that is a pretty high rank to have during BUDs. Two, I doubt any female will ever go to BUDs and if they ever do they certainly won't be the highest ranked person in training. A SEAL in training wouldn't be sent on a mission and receive a Navy Cross because of it. It seems like a really inspirational movie for women, but come on. Not gonna happen.
Lieutenant A.K. Waters (Tears of the Sun)
Bruce Willis plays a Navy SEAL Lieutenant who is 48 years old. It might make sense if he was enlisted then converted to an officer, but still that is pretty old for a SEAL LT leading a team in Nigeria. Bruce Willis was great and all, just not realistic.
Master Chief Neil Spaz Callaghan (Behind Enemy Lines II)
Matt Bushell is around 32 years old when this movie was released. If you compare the E-5 Cena to the E-9 Bushell characters they are basically the same age it really doesn't make sense. If you have a nickname of Spaz you probably won't make Master Chief. In the movie we are supposed to believe this character who is a Master Chief went through SEAL training with a current Lieutenant, which doesn't make sense. Assuming he joined the Navy when he was 18 years old how the hell does this guy make Master Chief in 14 years?
Lieutenant Red Winkle (Pearl Harbor)
Okay, so the guy who couldn't complete a fucking sentence was an officer. I didn't even notice it the first time I watched Pearl Harbor, after looking at IMDB I was pretty surprised.
Sergeant John Triton (The Marine)
The whole idea of taking a supplement to help you work out is completely anti-Marine. John Cena probably took a whole lot more than supplements to get as jacked as he was. Cena was around 30 years old when he did this movie. If he was this huge badass combat Marine, I doubt he would be a Sergeant. This is not what Marines look like, plain and simple.
Sergeant First Class William James (The Hurt Locker)
I really was entertained by this movie unlike a lot of people who thought it wasn't realistic enough. The story of this guy who was a Ranger becoming EOD is fairly believable, but everyone is lost at how Jeremy Renner's character bullshits his way through every situation. I was never Army EOD, but I can assure that there is no First Sergeant like him that tries to protect people from roadside bombs or stuff like that the way he does.