Looks good. If you're talking about the guys on the right (the Santum Arts Chargers), I regard them more like warbots than battledress. If you're talking about the guys on the left. It's a bit too dark to see exactly what the have on.
As for the muzzle flash, you might try putting point lights at the end of the barrels to illuminate the flash graphics, and to add more light to the people like a muzzle flash would.