This is DML’s M4A2 “Tarawa” kit. The Third Tank Battalion used these on Iwo Jima. The 4th and 5th Battalions used the M4A3. All varied by battalion, company and even platoon.
I have built “Demagog”, a D Co., 3rd Bat. tank. Wading stacks are by the Tank Workshop and replicate the SeeBees improvised design using 55gal drums. Markins are a combination of kit decals, Bison decals, and rub on letters, and goodness knows what else.
These tanks had a rebar rail, and rebar water can holders, welded to the rear deck. I replicated that with .020 styrene rod. Applique armor was boiler plate welded on, then painted with whatever was lying around.