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Appendix I: Comparison of Organization—Marine Division*

* All unit strength figures enclosed in parentheses are included in the strength totals of parent units. For a more complete breakdown of each of the four T/O series noted in this table, see Appendix H, supra, and the appropriate appendices in all previous books in this series with the exception of Volume I. The material in this appendix is derived from the Tables of Organization Subject File (HRS, HistBr, HQMC). The various T/Os were approved on the following dates: D-Series, 1 Jul 42; E-Series, 15 Apr 43; F-Series, 5 May 44; and G-Series, 4 Sep 45.

Unit D Series E Series F Series G Series Notes
Marine Division 19,514 19,965 17,465 19,176
Special Troops 3,031 2,317
HqBn (697) (851) 1,004 1,794
HqCo (334) (420) (483) (649)
SigCo (267) (340) (292) (348)
MPCo (96) (101) (102) (99)
ReconCo * (127) (113) *Prior to F-Series T/O, ReconCo was ScoutCo of Tank Bn
AssltSigCo *(465) *In May 1945, JASCO reorganized when J(oint) dropped and unit became organic to Marine division.
RocketPlt ((56)
WarDogPlt *(64) *Not including the 36 dogs assigned to each platoon.
SpecWpnsBn (856) (757)
H&SBtry (99) (102)
40-mmAAABtry (307) (307)
90-mmAAABtry (126)
3 AT Btrys (100) (116)
Parachute Bn *(583) *Became Corps Troops unit 15 Apr 43.

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Unit D Series E Series F Series G Series Notes
Lt TankBn (895) (707) 630 623 *Became 1st, 2nd, etc. TankBn w/F-Series.
H&S Co (80) (85) (123) (113)
Scout Co (175) (139) * *Redesignated to Div ReconCo w/F-Series.
4 Tank Cos (160) *(161) (169) (170) *Reduced to 3 cos. w/E-Series.
Service Troops 1,946 2,200 1,889 2,247
Service Bn (959) (661) (751) (732)
HqCo (55) (62) (68) (57)
Serv&SupCo (352) (455) (502)
Service Co (276)
Supply Co (157)
OrdCo (109) (144) (178) (242)
DivTransCo (116)
3 RegtlTransCos (109)
MT Bn (527) (539) (906)
H&S Co (188) (194) (76)
3 TransCos (113) (115)
AutoRprCo (349)
AmphibTrkCo (145)
4 Trk Cos (84)
MedBn (506) (526) (599) (609)
H&SCo (16) (21) (89) (104)
5 MedCos (98) (101) (102) (101)
AmTracBn (481) (486) * *Became Corps Troops unit 5 May 44.

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Unit D Series E Series F Series G Series Notes
EngrRegt 2,452 2,513 * *EngrRegt as such broken up into an EngrBn and a PionBn on 5 May 44; Seabees taken away from divisions, to be assigned/attached for specific operations.
H&SCo (273) (290)
Engr Bn (614) (645) 904 875
HqCo (29) (60) (307) (275)
3 Engr Cos (195) (195) (199) (200)
Pioneer Bn (743) (744) 745 750
HqCo (119) (120) (127) (134)
3 PionCos (208) (208) (206) (202)
Naval ConstBn (822) (838)
Artillery Regiment 2,581 3,207 2,639 2,661
H&S Btry (159) (204) (229) (249)
105-mm HowBn (607) *(594) (602) **(592) *Increased to 2 per regt. **Increased to 3 per regt.
H&S Btry (154) (150) (161) (166)
3 105-mm HowBtrys (151) (148) (147) (142)
3 75-mm PackHowBn (605) (605) *(603) *Reduced to 2 per regt.
155-mm HowBn (636)
H&S Btry (162)
3 155-mm HowBtrys (158)
3 Infantry Regiments 3,168 3,242 3,218 3,412
H&S Co (173) (186) (261) (249)
Wpns Co (196) (197) (203) (175)
3 Infantry Bns (933) (953) (918) (996)

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Unit D Series E Series F Series G Series Notes
HqCo (89) (137) (213) (270)
Wpns Co (273) (228)
3 Rifle Cos (183) (196) (235) (242)