OK. I can't really tell the difference between USMC and US Army, once they both start using the M16. I always thought it was that Marines wore camo helmet covers and Flak Jackets, but I have found out that Army grunts sometimes wore flak jackets too (although a slightly different pattern)
I got a big load of my Vietnam figures second hand in two job lots all mixed up and I am having real trouble telling them apart, in the bare metal.
Are there any other easy ways to differentiate them?