US Marine Corps OH 5 Victory and Occupation: Appendix K: World War II Development of the Marine Infantry Regiment†

Appendix K: World War II Development of the Marine Infantry Regiment†

Part 1—Infantry Regiment T/Os

Unit	D Series	E Series	F Series	G Series	Notes
Infantry Regiment	3,168	3,242	3,218	3,412
H&S Company	(173)	(186)	*(261)	(249)	* Company supply section became a service platoon
Weapons Company	(196)	(197)	(203)	(175)
Ccompany Hq	(48)	(69)	(71)	(51)
75-mm SP Gun Platoon	(34)	(26)	*(36)	**	* Increase of two 75-mm guns (total of four) in each platoon. **75-mm gun platoon replaced by a 105-mm howitzer (self-propelled) platoon.
3 AA and AT Platoons	(38)
3 37-mm Gun Platoons		(34)	(32)	*(40)	* Reduced to two platoons without reduction in number of guns.
105-mm SP Howitzer Platoon				(44)
3 Infantry Battalions	(933)	(953)	(918)	(996)
Headquarterrs Company	(111)	(137)	(213)	(270)
Battalion Hq	(75)	(123)	(138)	(131)
Company Hq	(36)	(14)	(17)	(26)
81-mm Mortar Platoon			(58)	(58)
Assault Platoon				(55)
Platoon Hq				(10)
3 Asslt Secs				(15)
SecHq				(1)
2 Asslt Sqds				(7)
Weapons Company	(273)	(228)
Company Hq	(29)	(41)
20-mm AA & AT Plt	(24)
81-mm Mortar Plt	(76)	*(58)	**		* Platoon strength reduced without reduction of mortars. **Mortar platoon placed in battalion headquarters company.
3 Machine Gun Plts	(48)	(43)	*		Machine gun platoon placed in rifle company.

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Unit	D Series	E Series	F Series	G Series	Notes
3 Rifle Companies	(183)	(196)	(235)	(242)
Company Headquarters	(29)	(28)	(53)	(51)
Hq Sec			(33)	(31)
60-mm Mort Sec			(20)	(20)
Weapons Platoon	(28)	(39)
Plt Sec	(4)	(4)
60-mm Mort Sec	(11)	*(16)			* An addititonal mortar and machine gun added to platoon; which now consisted of 3 mortars and 3 machine guns.
Lt MG Sec	(13)	*(19)	()	()
Machine Gun Plt			*(44)	**(56)	F-Series platoon had 12 machine guns; 6 air-cooled, and 6 water-cooled. *G-Series T/O platoon given an additional two guns.
3 Rifle Platoons	(42)	(43)	(46)	(45)
Platoon Hq	(7)	(7)	(7)	(6)
BAR Squad	(8)
3 Rifle Sqds	(9)	*(12)	(13)	(13)	* BAR Sqd dropped; platoon now consists of three rifle squads.

Part 2—Infantry Regiment Equipment

Weapons

Item	D Series	E Series	F Series	G Series	Notes
Carbine, .30 caliber, M1	943	1,405	1,794	1,383
Flamethrower, portable, M2–2			81	36
Gun:
20-mm, AA & AT	18
37-mm, AT		12	12	8
75-mm, SP	2	2	4
Gun, Machine:
.30 caliber, M1917A1	72	36	54	54
.30 caliber, M1919A4	36	69	65	66
.50 caliber, heavy-barrel, flexible	8	16	12	10
Gun, submachine, .45 caliber, with folding stock	507
Howitzer, M7, self-propelled				4
Launcher:
AT	47
Grenade, AT, M1	97

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Item	D Series	E Series	F Series	G Series	Notes
Rocket, AT, M1		53	43
Rocket, 2.36-inch, M9A1 or A18				35
Mortar:
60-mm	18	27	39	39
81-mm	12	12	12	12
Pistol, automatic, .45 caliber	17	*	*	408	*Carbines replaced Pistols in the infantry and artillery regiments in E- and F-Series T/Os.
Rifle:
.30 caliber, M1	1,385	1,673	1,179	1,393
.30 caliber, M1903	97
.30 caliber, automatic, Browning, M1918M2	162	162	243	243
Shotgun, 12-gauge		100	100	100

Transportation

Item	D Series	E Series	F Series	G Series	Notes
Ambulance, ¼-ton, 4x4		5	5	5
Station wagon, 4x4	2	2
Truck:
¼-ton, 4x4	55	48	36	34
¼-ton, radio-equipped		11	8	12
1-ton, 4x4, cargo	8	8	23	20
1-ton, 4x4, light repair	1	1	2

† The material in this appendix is derived from the D-, E-, F-, and G-Series Tables of Organization for each of the above units (Tables of Organization Subject File, HRS, HistBr, HQMC).