(Figures include Marine Corps and Navy, both officer and enlisted)
| Authorized by CMC ltr conf. Ser. 03C20550 of 25 Jul 54 and CMC ltr conf. Ser. 03A21250 of 4 Aug 50 | 1st Prov Marine Brigade (sailed San Diego 14 Jul 50 arrived Pusan, Korea 2 Aug 50) | Main body (sailed San Diego 10–22 Aug 50 arrived Kobe Japan 28 Aug to 10 Sep 50) | 7th RCT (sailed from Mediterranean 16 Aug 50 and San Diego 28 Aug-2 Sep 50 arrived Inchon on 21 Sep 50)476 | Total in Inchon-Seoul area on 23 Sep 50477 | |
| Units | Strength | ||||
| DIVISION | 22,343 | 4,770 | 12,195 | 5,336 | 20,218 |
| Hq Bn | 923 | 259 | 725 | 860 | |
| Hq Co | (656) | (182) | |||
| Mp Co | (140) | (38) | |||
| RcnCo | (127) | (39) | |||
| 1st Serv Bn | 827 | 173 | 656 | 785 | |
| 1st Sig Bn | 960 | 249 | 591 | 116 | 661 |
| 1st MT Bn | 783 | 118 | 582 | 89 | 761 |
| 1st Ord Bn | 558 | 124 | 438 | 518 | |
| 1st Med Bn | 636 | 99 | 432 | 107 | 667 |
| 1st Tank Bn | 907 | 181 | 677 | 132 | 921 |
| 1st SP Bn | 755 | 188 | 357 | 196 | 836 |
| 1st Engr Bn | 1,180 | 218 | 815 | 163 | 969 |
| 11th Marines | 3,108 | 518 | 1,845 | 697 | 3,009 |
| 1st Marines | 3,902 | 3,942 | 3,393 | ||
| 5th Marines | 3,902 | 2,643 | 4781,135 | 3,170 | |
| 7th Marines | 3,902 | 3,836 | 3,666 | ||
| FMF TROOPS | 3,969 | 554 | 3,167 | 2,973 | |
| 1st Armd Amph Bn | 526 | 490 | |||
| 1st Amph Trac Bn | 944 | 256 | 720 | 479842 | |
| 1st Amph Trk Co | 245 | 77 | 166 | 236 | |
| Btry C, 1st 4.5″ Rkt Bn | 90 | 89 | 77 | ||
| Carrier Plat FMF | 94 | 84 | 86 | ||
| 1st Comb Serv Grp | 1,434 | 109 | 1,120 | 1,167 | |
| 7th MT Bn | 431 | 418 | 410 | ||
| 1st Air Delivery Plat | 63 | 62 | 63 | ||
| 1st Fum & Bath Plat | 30 | 18 | 30 | ||
| VMO 6 | 112 | 112 | 62 | ||
| Total reinforced division | 26,312 | 5,324 | 15,362 | 5,336 | 23,191 |
476 Activated 17 Aug 50. The 3d Bn 6th Marines, in the Mediterranean, was assigned to the 7th Marines and, upon arrival in Kobe, Japan, on 3 Sept 50, was redesignated the 3d Bn 7th Marines. Augmentation personnel for this Battalion arrived in Kobe, Japan, on 14 Sept 50 on the USS Thomas Jefferson. The regimental commander and his staff arrived by air at Kobe on 6 Sept 50.
477 Based on Division Personnel Periodic Report No. 1 covering the period 15–23 Sept 50. The following losses and gains during the period are reflected in this report:
| Losses | Gains | Net Loss | ||
| KIA | 118 | Replacements | 28 | |
| WIA | 845 | Returned to duty | 160 | |
| MIA | 14 | 188 | 1,075 | |
| Non-battle Cas | 286 | |||
| 1,263 | ||||
478 Augmentation personnel for the 5th Marines (Reinf) already in Korea. The CO, 1st Marines was charged with the assembly and organization of the augmentation units for the 5th Marines (Reinf). Augmentation personnel were organized into three reinforced rifle companies. (The battalions of the 5th Marines in Korea contained only two rifle companies each.) The reinforced rifle companies were embarked together on one ship. Augmentation personnel for units of the Brigade, other than the 5th Marines, were attached to the reinforced rifle companies.
479 The 1st Armored Amphibian Tractor Battalion was left in Kobe. In addition, at Kobe, were the Division Administrative Center and some 500 17-year olds, who, by order of SecNav, were removed from the troop list just before sailing for Inchon. As of 15 Sept 50 there were the following personnel of the 1st Marine Division (Reinf) at Kobe:
| Marine Corps | Navy | Total | |||
| Officers | Enlisted | Officers | Enlisted | Officers | Enlisted |
| 59 | 1,268 | 3 | 14 | 62 | 1,282 |