Had a look at the US Elite Troops set, you can get two squads and a command team out of it (3 fire teams with M249, 3 with Javelin). Too many M203s to do more. They're a bit on the skinny side, but would be fine with Revell (and obviously other Caesar :wink: ) figures.
Orion do plastic modern Russians, take a look at the Plastic Soldier Review site. Don't think they're that useful for BE:MC 'though.