Only eight M4A3’s on Iwo Jima were modified with the Mark 1 Navy flamethrower. Four were with the 4th Tank Bn and four with the 5th Bn for the battle. The tanks of the 4th and 5th Tank Battalions on Iwo Jima represented the lessons learned from past Marine battles in the Pacific. Extra track welded on the turret and hull, sand bags on the hull deck, wood and concrete side armor all to protect against Japanese magnetic Anti-tank mines and satchel charges. Cages or nails welded to hatches to get a dead space between the hatches and satchel charges so that the hatches wouldn’t hurt the crewman under them. A water barrel mounted on the rear deck to give infantry water and prevent heat casualties, note the water pipe and spout. (This is why Marines were made to carry two canteens by the time of Iwo Jima.) An infantry phone on the left rear in a canvas bag so that infantry troops could tell tank crews were the target is. The Target clock enables new infantry to relate the target to the tank crew. The rear stowage foldable bin has been cut down and moved to the rear of the turret. Tow cables with one end already hooked up to speed in recovery of a knocked out tank. Most Marine Corps tanks did not use the .50 cal MG, it came with the tanks but they were given to the Marine Infantry units. (besides would you want to expose yourself to fire it on Iwo Jima?)
I don’t pretend to be an expert on the Sherman, Iwo Jima or Marine tanks in World War 2. With that said there are probably a lot more modifications that the Marines did that I haven’t mentioned. All in all, it was a fun build and I hope you enjoy the pictures.
Don