That's actually the story of the film and novel. Hell, you don't even "see" an alien until near the end of the book. Before then all the information about them and their activities that you're getting is curated from an extremely biased lens.
The novel actually plays it straight. The whole story is Johnny Rico only becoming a man when he serves in the military and kills aliens. Rico's dad is angry when his son joins up, but a few years later, he also joins and straight up tells his son that he was angry because his son was more of a man than he was and so he had to join too.
The film is definitely anti-militarization, though. Paul Verhoeven got halfway through the book and hated it so much that he specifically made the movie a mockery of the book's pro-militarization, pro-fascist stance.
If Robert Heinlein were alive, he'd be angry tweeting about Helldivers taking after the movie version of his book.
Also, I can't believe Helldivers is getting this much hype and excitement.