Gunnery Sargent Hartman was played by R. Lee Ermey who was an actual drill instructor in the United States Marine Corps from 1965-1967. And Ermey brought his own experience as a drill instructor to the role of Gny. Sgt. Hartman. I remember an interview were he talked about the scene where Hartman slaps Pyle to remind him of the difference between left and right. Hartman said something like, "We only have so many weeks to train these men before many of them would go into combat. If we had to slap someone to remind them which side was left and which was right, we slapped them."We need the right balance between self-criticism and faith in ourself, both are necessary, but in excess both can also be wrong. And the writters should start to teach what are the true differences between a toxic boss and good leader. Do you remember Sgt Hartman in the movie "the metalic jacket"? In the real life he would be killed by a crazy recruit, but the soldiers would make sure it looked like an accident in the battlefield. The fiction tells about how to kill a tyrant, but nothing about to manage a nation or a company.
And even in Full Metal Jacket, at the end of the basic training, Joker speaks almost admirably of the marine making process.
Joker said:Graduation is only a few days away, and the recruits of Platoon 3092 are salty. They are ready to eat their own guts and ask for seconds. The drill instructors are proud to see that we are growing beyond their control. The Marine Corps does not want robots. The Marine Corps want killers. The Marine Corps wants to build indestructible men, men without fear.
There's a common belief that you can't really make an anti-war movie because they all end up glorifying it one way or the other. And Warhammer 40k is really no different. No matter how evil the Imperium is, the Space Marines, Imperial Knights, Sisters of Battle, and even the Imperial Guard all look pretty badass and heroic.