Appendix E: Order of Battle of III Amphibious Corps (Less 77th Infantry Division) for the Guam Operation
Southern Landing Force Troops
Headquarters and Service Battalion, III Amphibious Corps (less detachments)
4th Ammunition Company
III Amphibious Corps Signal Battalion (less detachments)
Detachment, Argus 17
Detachment, Marine Air Warning Squadron 2
Detachment, 246th Aircraft Warning Company
Communications Unit 41
3rd Marine Division (reinforced)
3rd Marine Division
14th Marine Defense Battalion (less 155-mm. Seacoast Artillery Group, 2 batteries 90-mm. antiaircraft guns, 1 platoon searchlight, detachments, Headquarters and Service Battery)
1st Armored Amphibious Tractor Battalion (less Companies A and B)
3rd Amphibious Tractor Battalion (reinforced)
2nd Ammunition Company (less 4th Platoon)
III Amphibious Corps Motor Transport Battalion (less Company C – DUKWs)
Detachment, III Amphibious Corps Signal Battalion
2nd and 3rd War Dog Platoons
3rd JASCO
25th Naval Construction Battalion
2nd Aviation Engineer Battalion
Detachment, 5th Field Depot
1st Provisional Marine Brigade (reinforced)
1st Provisional Marine Brigade
9th Marine Defense Battalion (less 155-mm. Seacoast Artillery Group, 90-mm. Antiaircraft Group, detachments, Headquarters and Service Battery)
4th Amphibious Tractor Battalion (reinforced)
2nd Ammunition Company, 4th Platoon
1st Armored Amphibious Tractor Battalion, Companies A and B
III Amphibious Corps Motor Transport Bn – DUKWs, Company C
1st War Dog Platoon
3rd Naval Construction Battalion
5th Field Depot (less detachments)
III Amphibious Corps Medical Battalion (reinforced)
Corps Artillery
1st 155-mm. Battalion (howitzer)
7th 155-mm. Battalion (gun)
Garrison Force
3rd Marine Division (when released by III Amphibious Corps)
14th Marine Defense Battalion (less above detachments)
9th Marine Defense Battalion (less above detachments)
2nd Aviation Engineer Battalion
25th Naval Construction Battalion
53rd Naval Construction Battalion
Company B, 2nd Special Naval Construction Battalion
Communications Unit 41
Detachment, Argus 17
Detachment, Marine Air Warning Squadron 2
Detachment, 746th Aircraft Warning Company
Army Defense Troops
5th Field Depot
Source: III Phib Corps Opn Plan 1-44, Annex A, pp. 1-2.
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