Cool! I'd love to see it. Any pictures online anywhere?
There's one 15mm figure here, and some 25mm in the same camo scheme:
http://www.warbard.ca/2010/09/24/sg2-gallery-4-unsc-aliens/Somewhere I have a couple of in-game photos of my 15mm IFVs & MBT that go along with the UNSC Martian Legion infantry, but apparently not online. I've also got another small batch of APCs, light combat vehicles and civvie/paramilitary trucks and the like that I've never taken photos of, and which I've never bought the infantry for to make them a usable force. All my 15mm SF stuff is buried in a box somewhere, it's been at least two years since I've used it.
At one point I made up six or eight rocky Martian hills, but I left them up at the gaming club to reduce clutter and they went home with someone shortly after that...
Like I said, it's a slow-burn project. A very, very slow burn project.