Head/Torso: S.A.W Viper '90
Everything Else: Viper '86
Gun: Tunnel Rat ' 87
Backpack: Not Sure, black version of S.A.W. Viper '90

I was never quite sure why the guy with the biggest gun would make himself such a huge target by wearing a bright pink uniform. So instead, he gets the Viper blue and black make over

Also, that gun of theirs was just to big for its own good. I originally was going to use a '82 Rock 'N Roll M-60 ( like the most notorious S.A.W Viper of all time used in the comic ), but then I re-read the file card and it describes all sorts a image intensifiers. So, Tunnel Rat's gun became the obvious choice.

It's also interesting to note, with the way their card describes them, these guys would also work great as snipers, and not just machine gunners.