Shooting and blood splatters in the dogfight scenes
A pilot has a wooden stake in his leg and other men pull it out. His yelling is mildly disturbing. There is plenty of blood shown on the mans clothing.
Many dead men are shown.
The main character storms into a hospital to see a corpse with bullet holes in the chest. (Done tastefully, no blood or gore)
A nurse takes a man into a field hospital and shows him a large number of patients who are missing eyes, fingers, have their shirts pulled back exposing very grotesque wounds, are bleeding out of their faces and many burn marks. The scene is meant to establish Shock Value and is disturbing.
The main character is flying with about half his face covered in blood. It is dark and can only be seen through the light from his fired rounds.
Towards the end, there is a scene in a field hospital where a women is seen with her arm down the abdomen of a wounded soldier and many other doctors working with bloody instruments or clothing. The scene is quite graphic and is disturbing.