Excellent, however, this is going to be the general purpose marine unit for ALL the civs in the FF mod (well, the ones that don't have marine-type UU's), so the only reccomendations I have would be to change the web-harness to Red, and use that as the base civ-color... I realize that might play havoc with any explosion or gun-flash graphics, but I'd be willing to sort any palette messes out myself should any problems arise.
(just send the un-modified storyboard .BMP files with your base palette, and I can take it from there...)
Other than that, looks perfect... The Gun your Alein commando has looks pretty close to the weapons they have... or maybe you could see if Wyrm has any H-K UMP-45 models you could use, since that's the closest real weapon to what they have...