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.
*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.