Stop this retarded talking about 'realism'. It's misplaced.
Last time I looked it was realism that made games more fun. If all the humies had to do was launch a wave of sentient robots and sit back and watch from a hover chair, this game would suck.
That's exactly what hummies from the future would do. And they wouldn't fight a war in queue where they'd need to earn money by killing aliens either. And they'd probably nuke from orbit instead of sending troops with nothing but an outdated machine gun down to get killed.
Some things make sense in games, some things don't. When it comes to the helmet though, I agree. It's kind of ridiculous visually, and needs some improvement. It just looks wrong, even if the aim of the game isn't realism.