I know I'm not the one to correctly answer this question (so correct me if I'm wrong guys)
-The biggest difference I'm seeing is the smoke grenade launchers, marine version=loose pipes (I've no idea to explain that better #:-)) army version=more of a solid block of launchers.
- As I was told the marine version has a small telephone at the rear (never saw that...)
-Marine version has a busttle rack extension
-and offcourse a marine version carries marines...
Reading back my post I know I'm not of a lot of help here... #:-) Try posting this as a topic itself....
Jurgen