Why do all Combine soldiers wear respirators 24/7?

Corpes of combine found midgame.

what even is this

Yeah, it also makes it harder for him to breathe.

It's sexual. The Combine respirators are designed to invoke arousal, look at the way their filters are arranged-- two vertically aligned orifices-- AKA the anus and vagina. The human population is sex-starved because of the suppression field, The Combine place the most powerful sex symbols they know right on their soldiers' faces in order to coax admiration from the suppressed human race.

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All art directors have their own look, what are you fucking talking about.

Listen to the Overwatch voice lines and you'll hear a lot of medical jargon (inoculate, contain, sterilize). The Combine sends their forces across different planets and dimensions fighting all kinds of weird aliens, they've probably had to deal with a lot of diseases infecting their various thrall species.
Ironically, our own cops might end up wearing similar masks soon.

that's exactly what i'm talking about. don't get so buttmad

Regular troopers are but CP is just regular humans.

This is actually the best explanation I've heard.

is an excuse so programers don't have to make different models