Working on a WWII/Pacific Island/Jap/Sea Monster book and was doing some digging and found a pretty good source. This is going to keep me from looking like a total boob.
https://www.battleorder.org/usmc-rifle-co-1944
https://www.battleorder.org/usmc-rifle-co-1944
Organization (January 1944 to May 1945)
Type: Marine Infantry Company
Origin: U.S. Marine Corps (United States)
Time Frame (Battles): Saipan, Guam, Peleliu, Iwo Jima, Okinawa
Personnel: 7 Officers and 228 Enlisted (217 Enlisted before March '44)
Company Headquarters (3 Officers and 49/50 Enlisted)
→ 1× Company HQ Section (2 Officers, 31 Enlisted) [30 Enlisted before March '44]
1× Commanding Officer, Captain (OF-2), armed with 1 M1 Carbine
1× Executive Officer, Lieutenant (OF-1), armed with 1 M1 Carbine
1× First Sergeant, First Sergeant (OR-8), armed with 1 M1 Carbine
1× Gunnery Sergeant, Gunnery Sergeant (OR-7), armed with 1 M1 Carbine
1× Mess Sergeant, Technical Sergeant (OR-7), armed with 1 M1 Carbine
1× Supply Sergeant, Sergeant (OR-5), armed with 1 M1 Rifle
1× Demolition Sergeant [added in March '44], Sergeant (OR-5), armed with 1 M1 Rifle
1× Armorer, Corporal (OR-4), armed with 1 M1 Rifle
1× Signalman, Corporal (OR-4), armed with 1 M1 Rifle
1× Carpenter, Corporal (OR-4), armed with 1 M1 Rifle
2× Field Musicians, Field Music (OR-1), armed with 1 M1 Carbine each
2× Messengers, Private (OR-1), armed with 1 M1 Rifle each
1× Barber, Private (OR-1), armed with 1 M1 Rifle
1× Cobbler, Private (OR-1), armed with 1 M1 Rifle
1× Driver, Private (OR-1), armed with 1 M1 Carbine
11× Other Duty Marines, Private (OR-1), armed with 1 M1 Rifle
1× Chief Cook [removed March '44], Chief Cook (OR-5), armed with 1 M1 Rifle
1× Field Cook, Field Cook (OR-4), armed with 1 M1 Rifle
4× Assistant Cooks [only 3 before March '44], Assistant Cook (OR-2), armed with 1 M1 Rifle
→ 1× Mortar Section (1 Officer, 19 Enlisted)
1× Section Commander, Lieutenant (OF-1), armed with 1 M1 Carbine
1× Section Leader, Sergeant (OR-5), armed with 1 M1 Carbine
3× Mortar Squads (6 Enlisted):
1× Squad Leader, Corporal (OR-4), armed with 1 M1 Carbine
1× Gunner, Private (OR-1), armed with 1 60mm mortar and 1 M1 Carbine
1× Assistant Gunner, Private (OR-1), armed with 1 M1 Carbine
3× Ammo Bearers, Private (OR-1), armed with 1 M1 Carbine each
→ Attachments:
1× Hospital Corpsman (U.S. Navy)
→ Additional Equipment: Each company headquarters section had 1 jeep with trailer, 3 Bazookas (reserve), and 6 M2 Browning heavy machine guns (reserve). The jeep would often be used to support the Mortar Section as they lacked a handcart.
3× Rifle Platoons (1 Officer and 44/45 Enlisted each)
→ 1× Platoon Headquarters (1 Officer and 6 Enlisted) [5 Enlisted before March '44]
1× Platoon Commander, Second or First Lieutenant (OF-1), armed with 1 M1 Carbine
1× Platoon Sergeant, Platoon Sergeant (OR-6), armed with 1 M1 Carbine
1× Platoon Guide, Sergeant (OR-5), armed with 1 M1 Rifle
1× Demolition Corporal [added in March '44], Corporal (OR-4), armed with 1 M1 Rifle
3× Messengers, Private (OR-1), armed with 1 M1 Rifle each
→ Attachments:
2× Hospital Corpsmen (U.S. Navy)
→ 3× Rifle Squads (13 Enlisted each)
1× Squad Leader, Sergeant (OR-5), armed with 1 M1 Carbine
3× Fire Teams of:
1× Fire Team Leader, Corporal (OR-4), armed with 1 M1 Rifle
1× Automatic Rifleman, Private (OR-1), armed with 1 M1918A2 Browning Automatic Rifle
1× Assistant Automatic Rifleman, Private (OR-1), armed with 1 M1 Carbine
1× Rifleman, Private (OR-1) to Technician 4th Grade (OR-5), armed with 1 M1 Rifle
Additional Equipment: All men in the Rifle Squads with M1 Carbines were authorized M8 grenade launchers on paper. All men in the Rifle Squads with M1 Rifles were authorized M7 grenade launchers although these were usually used by fire team leaders.
1× Machine Gun Platoon (1 Officer and 36/43 Enlisted each)
→ 1× Platoon Headquarters (1 Officer and 4 Enlisted) [3 Enlisted before March '44]
1× Platoon Commander, First Lieutenant (OF-1), armed with 1 M1 Carbine
1× Platoon Sergeant, Gunnery Sergeant (OR-7), armed with 1 M1 Carbine
1× Ammunition Corporal [added in March '44], Corporal (OR-4), armed with 1 M1 Carbine
2× Messengers, Private (OR-1), armed with 1 M1 Rifle each
→ Attachments:
1× Hospital Corpsman (U.S. Navy)
→ 3× Machine Gun Sections (13 Enlisted each) [11 Enlisted each before March '44]
1× Section Leader, Sergeant (OR-5), armed with 1 M1 Carbine
2× Machine Gun Squads of:
1× Squad Leader, Corporal (OR-4), armed with 1 M1 Carbine
1× Gunner, Private (OR-1), armed with 1 M1919A4 machine gun and 1 M1 Carbine
1× Assistant Gunner, Private (OR-1), armed with 1 M1 Carbine
3× Ammo Bearers [only 2 before March '44], Private (OR-1), armed with 1 M1 Carbine each