Easy example: compare the Marvel "Civil War" comics to the movies. The former was critical of the military in a way that could not happen in any big blockbuster movie.
Then you've got things like Full Metal Jacket, which I don't think is getting anyone to sign up for the forces.
Like Top Gun did well recently, but is one of the only movies I can think of in the past couple of years that actually portrayed the US military in a mostly positive light rather than the usual gamut which runs from ineffective bumbling ossfied and useless to straight up evil.
I'm just saying you can make whatever you want in the US and portray pretty much any idea or theme, that doesn't mean people will like it, but you can make it. In China there is no similar comparison they'll take your studio at best or imprison you at worst.
For example, the Transformers movies: https://www.wired.com/2008/12/pentagon-holl-1/
The general concept: https://en.m.wikipedia.org/wiki/Military-entertainment_compl...