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T/O E-100

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Approved on 15 April 1943, the E-100 series table of organization formed the basis of the Marine divisional structure of the mid-war period. Divisions organized under T/O E-100 fought in the campaigns for the Northern Solomons, Cape Gloucester, and Tarawa. At various stages in their careers, the 1st, 2nd, 3rd, and 4th Marine divisions all utilized the E-100 table of organization.

Marine Division Table of Organization E-100
Divisional units Officer
USMC
Enlisted
USMC
Officer
USN
Enlisted
USN
Total
Division Headquarters (51) (139) (8) (13) (211)
Special Troops 157 2,098 14 46 2,317
Headquarters Battalion (83) (736) (11) (21) (851)
Special Weapons Battalion (38) (703) (2) (14) (757)
Tank Battalion 36 659 1 11 707
Service Troops 78 1,682 42 398 2,200
Service Battalion (27) (614) (2) (18) (661)
Motor Transport Battalion (28) (489) (1) (9) (539)
Amphibian Tractor Battalion (22) (454) (1) (9) (486)
Medical Battalion (1) (125) (38) (362) (526)
Engineer Regiment 74 1,548 35 860 2,517
Engineer Battalion (21) (614) (1) (9) (645)
Pioneer Battalion (31) (678) (3) (32) (744)
Naval Construction Battalion (26) (812) (838)
Artillery Regiment 188 2,956 9 54 3,207
3 Pack Howizer Battalions (each) (34) (561) (1) (9) (605)
2 Howitzer Battalions (each) (33) (551) (1) (9) (594)
3 Infantry Regiments (each) 137 2,984 11 110 3,242
3 Infantry Battalions (each) (36) (883) (2) (32) (953)
Division Totals 908 17,236 133 1,688 18,924

Notes:
1. Numbers in parentheses are included in the strength of the next higher headquarters.
2. For clarity, company size units are omitted from this table. All units inclued headquarters companies, and either subordinate companies, or batteries.

Major Weapons and Transportation of the E-series Marine Division
WEAPON NUMBER TRANSPORTATION NUMBER
Carbine, .30 cal., M1 11,074 1/4-ton 4x4 Ambulance 48
Flamethrower, portable 24 1/2-ton 4x4 Ambulance 11
Gun, 37mm, antitank 54 5-passenger car 3
Gun, 40mm, antiaircraft 16 Motorcycle 12
75mm M3 antitank halftrack 12 4x4 station wagon 12
M1919A4 machine gun 682 Amphibian Tractor 100
M1917A1 machine gun 108 Miscellaneous Tractors 73
M2 HB machine gun 343 1/4-ton cargo trailer 92
M1A1 .45 submachine gun 78 1/2-ton dump trailer 20
Pack howitzer, 75mm 36 1-ton cargo trailer 125
Howitzer, 105mm 24 1-ton water trailer 81
M1A1 antitank rocket launcher 243 Miscellaneous trailers 123
60mm mortar 81 1/4-ton 4x4 truck 375
81mm mortar 81 1/4-ton 4x4 truck w/radio 134
M1911A1 .45 cal. pistol 299 1-ton 4x4 cargo truck 268
Rifle, .30 cal., M1 8,030 1/4-ton 4x4 truck w/radio 22
M1918A2 BAR 558 2 &1/2-ton 4x4 cargo truck 48
Shotgun, 12 gauge 306 2 & 1/2-ton 6x6 cargo truck 198
Light tank 54 2 & 1/2-ton 6x6 dump truck 51
Light tank retriever 3 Miscellaneous trucks 51

NOTE: The source for all information on the page is T/O E-100, 15 April 1943.

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