American Forces on Saipan
| Northern Troops and Landing Force Troops | Commander LTG Holland M. Smith, USMC (until 12 July 1944) |
Strength 66,779 |
| Northern Troops and Landing Force Troops | LTG Holland M. Smith, USMC (until 12 July 1944) | 2,296 |
| Headquarters and Service Battalion, V Amphibious Corps (less detachments) | ||
| Headquarters, Provisional Engineer Group, V Amphibious Corps | ||
| Headquarters, Provisional LVT Group, V Amphibious Corps | ||
| Amphibious Reconnaissance Battalion, V Amphibious Corps (less detachments) | ||
| Motor Transport Company, V Amphibious Corps (less detachments) | ||
| Medical Battalion, V Amphibious Corps | ||
| 31st Field Hospital | ||
| 2d Provisional Portable Surgical Hospital | ||
| 3rd Provisional Portable Surgical Hospital | ||
| 7th Field Depot (less detachments) (reinforced) | ||
| Mobil Communication Unit, Central Pacific | ||
| Signal Battalion, V Amphibious Corps (less detachments) | ||
| Detachment, Company C, 101st Signal Battalion | ||
| Air Warning Squadron 5 (less detachments) | ||
| Detachment, 680th Air Warning Company | ||
| Detachment, 726th Air Warning Company | ||
| Detachment, 763rd Air Warning Company | ||
| 2nd Marine Division | MG Thomas E. Watson, USMC | 21,746 |
| Headquarters Battalion | ||
| Medical Battalion | ||
| Motor Transport Battalion | ||
| Service Battalion | ||
| Tank Battalion | ||
| 2nd Marines (less 1 battalion) | ||
| 6th Marines | ||
| 8th Marines | ||
| 10th Marines (artillery) | ||
| 18th Marines (engineers) | ||
| Attached Units: | ||
| 1st Battalion, 29th (reinforced) | ||
| 2nd 155-mm Artillery Battalion | ||
| 2nd Provisional Rocket Detachment | ||
| 2nd Amphibious Tractor Battalion (LVT) | ||
| 5th Amphibious Tractor Battalion (LVT) | ||
| 715th Amphibious Tractor Battalion (LVT-A) | ||
| 1st Amphibious Truck Company | ||
| 18th Naval Construction Battalion | ||
| 2nd Joint Assault Signal Company | ||
| 4th Marine Division | MG Harry Schmidt, USMC (until 12 July 1944) | 21,618 |
| Headquarters Battalion | ||
| Medical Battalion | ||
| Motor Transport Battalion | ||
| Service Battalion | ||
| Tank Battalion | ||
| 23rd Marines (less 1 battalion) | ||
| 24th Marines | ||
| 25th Marines | ||
| 14th Marines (artillery) | ||
| 20th Marines (engineers) | ||
| Attached Units: | ||
| 4th 105-mm Artillery Battalion (howitzer) (V Amphibious Corps) | ||
| 1st Provisional Rocket Detachment | ||
| 10th Amphibious Tractor Battalion (LVT) (Army) | ||
| 534th Amphibious Tractor Battalion (LVT) (Army) (less Company A, less 1st Platoon) | ||
| 708th Amphibious Tractor Battalion (LVT-A) (Army) | ||
| 773rd Amphibious Tractor Battalion (LVT) (Army) | ||
| 2nd Amphibious Truck Company | ||
| 121st Naval Construction Battalion | ||
| 1st Joint Assault Signal Company | ||
| 311th Port Company (Army) | ||
| 539th Port Company (Army) | ||
| Detachment, Air Warning Squadron 5 | ||
| Detachment, 7th Field Depot | ||
| 1st Battalion, 2nd Marines (reinforced) | 1,084 | |
| XXIV Corps Artillery: | BG Arthur M. Harper, USA | 2,682 |
| Headquarters and Headquarters Battery | ||
| 1st Provisional Gun Group (155-mm howitzer) | ||
| 2nd Battalion, 55th Coast Artillery | ||
| 32nd Coast Artillery Gun Battalion | ||
| 225th Field Artillery Howitzer Group | ||
| 145h Field Artillery Battalion | ||
| 225th Field Artillery Battalion | ||
| 447th Amphibious Truck Company | ||
| Provisional Antiaircraft Artillery Group | 949 | |
| 864th Aircraft Warning Antiaircraft Battalion (less detachments) | ||
| 751st Antiaircraft Battalion (A and B Batteries) | ||
| 27th Infantry Division | MG Ralph C. Smith, USA | 16,404 |
| Headquarters, 27th Infantry Division | ||
| Headquarters, Special Troops | ||
| Headquarters Company | ||
| Military Police Platoon | ||
| 27th Cavalry Reconnaissance Troop | ||
| 27th Division Band | ||
| 27th Ordinance Company | ||
| 27th Quartermaster Company | ||
| 105th Infantry | ||
| 106th Infantry | ||
| 165th Infantry | ||
| Headquarters, 27th Divisional Artillery | ||
| 104th Field Artillery Battalion | ||
| 105th Field Artillery Battalion | ||
| 106th Field Artillery Battalion | ||
| 249th Field Artillery Battalion | ||
| 102nd Engineer Battalion | ||
| 102nd Medical Battalion | ||
| Attached Units: | ||
| 762nd Tank Battalion | ||
| 766th Tank Battalion | ||
| 1165th Engineer Group Headquarters | ||
| 34th Engineer Battalion | ||
| 152nd Engineer Battalion | ||
| 1341st Engineer Battalion | ||
| 94th Bomb Disposal Squad | ||
| 95th Bomb Disposal Squad | ||
| 38th Field Hospital | ||
| 98th Portable Surgical Hospital | ||
| 295th Joint Assault Signal Company | ||
| 88th Chemical Battalion | ||
| 604th Quartermaster Graves Registration Company | ||
| Detachment, 534th Amphibious Tractor Battalion |