The space marines were from Aliens, the 2nd film in the franchise by James Cameron. AVP started ok with a respectful fan as the driving force, but the 2nd effort killed that franchise. I mean, great creatures but it was still your basic american small town monster B Movie = done to death and pretty sh!t in the 1st place...
I think if someone were wearing the body armour and helmet, or a good facsimile, they'd look fine with a pulse rifle at a skirmish (I've considered it) except that it'd have to be blue to match this horrible creation!
Not quite dead yet, mate... definitely whiskers unresponsive though!