Regimental Combat Team 23 [Roi]
23rd Marines (+)
3rd Composite Engineer Battalion
4th Amphibian Tractor Battalion [100xLVT(2)]
Companies A and C, 1st Armored Amphibian Tractor Battalion [LVT(A)1]
Company C (Medium) (+), 4th Light Tank Battalion [M4A2/M5A1]
Company C, 4th Medical Battalion
Company C, 4th Motor Transport Battalion
Battery C, 4th Special Weapons Battalion
Regimental Combat Team 24 [Namur]
24th Marines (+)
2nd Composite Engineer Battalion
10th Amphibian Tractor Battalion (LVT(2))*
Companies B and D, 1st Armored Amphibian Tractor Battalion [LVT(A)1]*
Company B, 4th Light Tank Battalion [M5A1]
Company B, 4th Medical Battalion
Company B, 4th Motor Transport Battalion
Battery D, 4th Special Weapons Battalion
* Transferred from RCT25 D+1.
Regimental Combat Team 25 [“Ivan” Landing Group/Division Reserve]
25th Marines (+)
14th Marines [artillery] (division control D+1)
1st Composite Engineer Battalion
10th Amphibian Tractor Battalion (Reinforced) [LVT(2)]
Company A (+), 11th Amphibian Tractor Battalion [LVT(2)]
Companies B and D, 1st Armored Amphibian Tractor Battalion
[LVT(A)1]
Company A, 4th Light Tank Battalion [M5A1]
Company D (Scout), 4th Light Tank Battalion
Battery B, 4th Special Weapons Battalion
Company A, 4th Medical Battalion
Company A, 4th Motor Transport Battalion
Support Group
HQ Battalion, 4th MarDiv (-)
20th Marines [engineer] (-)
1st Armored Amphibian Tractor Battalion (-)
4th Light Tank Battalion (-)
4th Medical Battalion (-)
4th Motor Transport Battalion (-)
4th Service Battalion (-)
4th Special Weapons Battalion (-)
15th Defense Battalion (Garrison Force)
Regimental Combat Team 17
17th Infantry Regiment (+)
Company A, 13th Engineer Combat Battalion
Company A, 7th Medical Battalion
two groups, 708th Prov Amphibian Tractor Battalion
Troops A and B, 7th Cavalry Reconnaissance Troop
Regimental Combat Team 32
Company A, 767th Tank Battalion [M4A2]
Company B, 13th Engineer Combat Battalion
Company B, 7th Medical Battalion
group, 708th Prov Amphibian Tractor Battalion
Regimental Combat Team 184
Company B, 767th Tank Battalion [M4A2]
Company C, 13th Engineer Combat Battalion
Company C, 7th Medical Battalion
group, 708th Prov Amphibian Tractor Battalion
Division Artillery
31st Field Artillery Battalion (105mm)
48th Field Artillery Battalion (105mm)
49th Field Artillery Battalion (105mm)
57th Field Artillery Battalion (105mm)
145th Field Artillery Battalion (155mm) [attached]
Prov DUKW Battery, 7th InfDiv Artillery
7th Medical Battalion (-)
13th Engineer Combat Battalion (-)
Special Troops
7th Signal Company
7th Quartermaster Supply Company
707th Ordnance Light Maintenance Company
Attachments
50th Engineer Combat Battalion
708th Prov Amphibian Tractor Battalion
787th Tank Battalion
Company D, 34th Engineer Combat Regiment
75th Joint Assault Signal Company
91st Separate Chemical Company [4.2in. mortar]
31st Medical Field Hospital
Garrison Force
1st Battalion, 47th Engineer General Service Regiment
3rd and 4th Army Defense Battalions
139th AAA Group
96th, 98th (-), and 753d (-) AAA Battalions (90mm Gun)
867th AAA Battalion (Automatic Weapons) (-) [40mm/.50cal.]
Battery A, 55th Coast Artillery Battalion (Harbor Defense) [155mm gun]
Batteries E and F, 57th Coast Artillery Battalion (Harbor Defense) [155mm gun]
Company B, 376th Quartermaster Port Battalion
Roi-Namur after being completely rebuilt by Seabees and established as an airbase. As with many such conquered islands, it was virtually stripped and leveled as extensive base facilities were constructed.
HQ, Tactical Group 1, VAC
708th Prov Amphibian Tractor Battalion (-)
Company A, 708th Amphibian Tank Battalion
Amphibious Reconnaissance Company, VAC
Company D (Scout), 4th Light Tank Battalion
Portable Surgical Hospital No. 1 (Prov)
22nd Marines (Reinforced)
2nd Separate Pack Howitzer Battalion
Engineer Company, 22nd Marines
Medical Company, 22nd Marines
Motor Transport Company, 22nd Marines
Tank Company, 22nd Marines [M4A1]
Groups B and C, 708th Prov Amphibian Tractor Battalion
106th Infantry Regiment (Reinforced) (- 2nd Battalion)
104th Field Artillery Battalion (105mm Howitzer)
104th Engineer Combat Battalion (Corps) (-)
Company B (-), 102nd Engineer Combat Battalion
Company C, 766th Tank Battalion [M4A1]
Group D, 708th Prov Amphibian Tractor Battalion
Companies C and D (-), 102nd Medical Battalion
Prov DUKW Battery, 7th InfDiv Artillery
Group Reserve
10th Defense Battalion (Garrison Force)
Garrison Force
3rd Army Defense Battalion
1st Battalion, 47th Engineer General Service Regiment
One company, 110th Naval Construction Battalion
2nd Battalion (+), 106th Infantry Regiment
Amphibious Reconnaissance Company, VAC
1st Defense Battalion (Garrison Force)
Scores of unopposed landings were made on islands and islets throughout the Marshalls as part of Operation “Flintlock, Jr.”, the securing of the Lesser Marshalls.