Yoshikazu Yasuhiko, one of the creative minds behind the original Gundam series felt the need to create the Mobile Suit Gundam: The Origin manga because too many kids thought the War is Hell story to be War is Cool and felt the need to make it more clear.
Also, stack copyright infringement on top of the other crimes by the US military. Pretty sure Anno and the rest of Gainax wouldn't be happy about this.
It's actually quite easy. Just focus on the victims rather than the killers. Come and see, Grave of the Fireflies, Catch-22, All quiet on the Western Front, …
Band of Brothers is also a good one. War movies are so often the "moment of heroism" or tragedy, but in reality, it's not a moment. It's months, years on end of always being on full alert, where one false step one time is enough to die.
Bump for Come and See. I believe it's a government sponsored Belarusian anti-war film and it's pure horror. Watch that if you believe all war films glorify war.
You just need to embrace the glorifying war aspect like how Starship Troopers does it, and just be so ridiculously over the top that it's blatantly obvious how over the top it is.
It's a great example of media literacy, and specifically - thesis, antithesis, and synthesis.
The first reading is, holy shit, is Doogie Horrible wearing an SS uniform? This is fascist propaganda.
The second reading is, ah, everything goes terribly and nobody learns anything. This is an anti-fascist satire.
The third reading is... how are you different from these characters? What do you know, that they don't, that would stop you from wanting to know more? This is a movie about how fascism happens.
I don't know how to break it to you, but Paul Verhoven's satire pieces (e.g. Starship Troopers, Robocop) are a little too good. Far too many people miss the point, even today, with the entire film spoiled and then some.