
My incredibly vain splash above

I’ve done some more work on the estab file and have come up with a rudimentary effort based on the Table of Organization F-1 that was implemented in May 1944. The result is a mock-up of the 3rd Marine Division, with varying levels of success based on time constraints and information resources available.
Please note that this if anything is to be regarded as an “Alpha” version, most certainly not ready for prime time (but a work in progress nonetheless).
The core building block is the four man fire team which consists of the following and branches out accordingly:
Three M1 Rifles, 1 BAR
Three fire teams are led by a squad leader, issued a M1 Carbine, making a Rifle Squad
Three Rifle Squads are led by a platoon HQ, issued 2 M1 Rifles, 5 M1 Carbines and a 1 M9A1 Bazooka, making a Rifle Platoon
Three Rifle Platoons are complemented by an organic Machine Gun Platoon consisting of 22 M1 Rifles, 4 M1 Carbines and 6 M1919A4 machine guns
This is further enhanced with an organic Mortar section consisting of 18 M1 Rifles, 1 M1 Carbine and 3 81mm mortars
This is rounded out by a HQ element which consists of 31 M1 Rifles and 2 M1 Carbines
This combined force of 158 M1 Rifles, 27 BAR, 31 M1 Carbines, 6 M1919A4 machine guns, 3 M9A1 Bazookas and 3 81mm mortars constitutes a 222 man Rifle Company (the bazooka and mortar teams would have weapons as well, the machine gunners would not which is why the count is slightly off).

Three Rifle Companies would be complemented by a mortar platoon consisting of 54 M1 Rifles, 4 M1 Carbines and 9 81mm mortars. This force is rounded out with 125 M1 Rifles and 13 M1 Carbines which would constitute the Battalion HQ, Intelligence Section, Supply Section, Communications Platoon and US Navy Medical Detachment.
This presents a battalion sized element of 653 M1 Rifles, 81 BAR, 110 M1 Carbines, 9 M9A1 Bazookas, 18 M1919A4 machine guns and 18 81mm mortars for a total personnel strength of 862.

Three Rifle Battalions are complimented with a regimental headquarters unit, a regimental base unit and 4 anti-tank gun platoons consisting of 4 M6 37mm guns each. The HQ and the base I am completely clueless on as to personnel count and weapon mix, so I am using a clone of the US Army Line regiment HQ and base estab’s.
The total regiment count is 3,055.

Three regiments are grouped together and complimented with an attached tank battalion which I did model off of very specific information (three companies of 15 Sherman’s each), however I just took a wild guess at the naming convention for the Battalion HQ and subordinate companies.

The final piece of the division is the artillery assets, which I have tagged in the force list as 1-4 Battalions of the 12th Marines (again most likely totally off base here so any help would be appreciated). These battalions each consist of 12 105mm M2A1 howitzers, jeeps, trucks and what have not from the cloned estab.

The attached sample mission is called “Battle Axe”. It assumes that Japan has surrendered in May 1944 which frees the United States Marine Corps to participate in the European Theater and the final push to Berlin. It is not intended to be a serious mission, only a fictional what-if to test out the workings of everything.
I am certain I have a ton of things wrong, from weapons used to naming nomenclature to organizational structure, however I am open to constructive criticism and especially anyone who can call something out that can be backed up by web-based documentation (such as a link to Wikipedia or some other online resource I can refer to without having to trudge to the local library).
To play the attached mission, I am not sure if you have to have the .xml and the .coe files in your Estabs directory of the game, so I am including them as well.

Don’t leave your Marines on the beach!!
Once the force list is imported into a scenario, the cohesion can be adjusted accordingly for that specific mission (i.e. have the Marines start out with "SNAFU" or "Shambles" as the cohesion setting to simulate a beach landing or other water borne insertion).
Links
Force List and Estab Files (2)
Battle Axe Scenario
Units Colors
The unit color scheme for the Marine Corps is scarlet (255/36/0) and gold (255/215/0):

I know this is visually close to the British para units in the HTTR expansion pack, however those are the official colors of the Marines.