Great concept. With body armor that only covers vital organs, a huge number of soldiers have lost limbs, and it's touching that you'd honor them in figure form.
On the lower legs, I'd think that even prosthetics would be covered by his pants. Are those Galactic Marine feet and a B.A.T.S. arm I spy?
Going for an all-soft-goods figure is a big, ass numbing job. The scarf does look great, but I'm not sure I dig the vest and ammo pouches. But that's really my personal preference, since I don't even like the soft stuff that comes with Star Wars figures. It's really difficult to pull off that all-soft look without spending a TON of time on it, and I applaud you for the effort. I've tried it myself, but the result was awful and I won't post it. Ever.
Obi-Shinobi's done a ton of soft work over the years, but my favorite is a 3-3/4" Snake Eyes he made few years ago with AMAZING canvas web gear, pouches, holsters, and even a sword sheath. My favorite pic is below, and
here's a link to the whole gallery. It includes a couple pics of the 12" Sideshow SE for comparison.
My only other suggestion is for the head comms. Although it's not an exact replica of the gear troops currently use, I think the wraparound headset that comes with one of the SW Jango Fetts would be perfect. Can't remember which figs come with it though. Anyway, good work, and keep at it!