Sherman use by the United States Marines: “The enemy’s power lies in his tanks.” Lieutenant General Mitsuru Ushijima, Okinawa.
Most people have the idea the Marines used the M4A2, and only the M4A2, and list things like ‘it was a diesel, like Navy landing craft used, so like common fuel bro’ as the reason the marines chose the tank. The real reason they got A2, was that’s what was available when they asked, there wasn’t much choice involved, and they should feel lucky the army didn’t dump M3 Lee’s on them. At various times the Marines also used M4A1s, and M4A3, all with the 75mm gun.
By the end of the war the Marines would be experts in employing the tank, Infantry, team. The Marines, like their European Army counterparts used, Yankee ingenuity to modify their Shermans to help them survive combat their designers had no idea they would see. These modifications included improvised water proofing, and deep wading kits. They also included improvised add on armor made of wood and concrete, and the use of spikes and screens over the hatches to help prevent the Japanese from using explosives directly on the periscope ports and hatches.
The Marines had toyed around with tanks in the 20 and 30s but never had the budget to buy many. The ones they did buy were all light tanks that wouldn’t see combat use. The first tank they would use in combat in WWII was the M3 light, using it on in all major campaigns until 1943 when the Sherman entered the scene. The first combat for the Sherman would be Tarawa, were they used a battalion of tank that was mixed, two companies of lights and one of mediums. After Tarawa, the use of lights would not be fully suspended, but the Sherman would be the tank of choice for the rest of the war and lights would be phased out.
The marines ultimately ended up with six tank battalions and a training school at Camp Eliot California. The first two battalions formed were the 1st and 2nd and deployed without training at the tank school, and a lot of rejects from other units. After the first two battalions formed, most of the Marines tankers went through the school, and the school trained almost all the new NCOs and officers. When the war ended, all but the 1st and 2nd were disbanded, and the 1st and 2nd have remained active since the beginning, and are still in operation today.
When the fighting was over on Okinawa, Major-General Lemuel Shepard, the Marine ground commander had this to say: “If any one supporting arm can be singled out as having contributed more than any others during the progress of the campaign, the tank would certainly be selected.”
The Sherman would go on serving the Marines in Korea, though by then it was just the M4A3 105 tanks and Sherman based recovery vehicles.