Okinawa ground order of battle



The American invasion of island of Okinawa, codenamed Operation Iceberg, took place 1 April 1945. The Japanese military was determined to inflate a casualty rate so high that the U.S. government would choose not to invade the Japanese home islands. To this end, the southern portion of the island had been covered with the most extensive system of fortifications and fields of fire yet encountered in the Pacific War.

The island was not declared secure until 22 June, a period of 82 days. Lieutenant General Simon Bolivar Buckner became the highest ranking U.S. military officer to be killed in action in the Second World War.

American forces
US Tenth Army Lieutenant General Simon Bolivar Buckner, USA (KIA 18 Jun) Major General Roy S. Geiger, USMC (18 Jun thru 23 Jun) Lieutenant General Joseph W. Stilwell, USA (from 23 Jun)

Northern Landing Beaches
III Amphibious Corps Major General Roy S. Geiger, USMC Embarked in Task Force 53 Left Beaches: 6th Marine Division (24,356 officers and enlisted) Right Beaches: 1st Marine Division (26,274 officers and enlisted)
 * Division Commander: Major General Lemuel C. Shepherd, Jr., USMC
 * 22nd Marine Regiment – Green Beaches
 * 4th Marine Regiment – Red Beaches
 * 29th Marine Regiment – Reserve
 * 15th Marine Regiment (Artillery)
 * Division Commander: Major General Pedro A. del Valle, USMC
 * 7th Marine Regiment – Blue Beaches
 * 5th Marine Regiment – Yellow Beaches
 * 1st Marine Regiment – Reserve
 * 11th Marine Regiment (Artillery)

Southern Landing Beaches
XXIV Army Corps Major General John R. Hodge, USA Embarked in Task Force 55 Left Beaches: 7th Infantry ("Bayonet") Division (21,929 officers and enlisted) Right Beaches: 96th Infantry ("Deadeye") Division (22,330 officers and enlisted) Reserve: 27th Infantry ("New York") Division (16,143 officers and enlisted)
 * Division Commander: Major General Archibald V. Arnold, USA
 * 17th Infantry Regiment – Purple Beaches
 * 32nd Infantry Regiment – Orange Beaches
 * 184th Infantry Regiment – Reserve
 * Field Artillery Battalions, 105mm: 48th, 49th, 57th
 * Field Artillery Battalions, 155mm: 31st
 * Division Commander: Major General James L. Bradley, USA
 * 381st Infantry Regiment – White Beaches
 * 383rd Infantry Regiment – Brown Beaches
 * 382nd Infantry Regiment – Reserve
 * Field Artillery Battalions, 105mm: 361st, 362nd, 921st
 * Field Artillery Battalions, 155mm: 363rd
 * Division Commander: Major General George W. Griner, Jr., USA
 * 105th Infantry Regiment – landed L+8
 * 106th Infantry Regiment – landed L+8
 * 165th Infantry Regiment – landed L+8
 * Field Artillery Battalions, 105mm: 104th, 105th, 249th
 * Field Artillery Battalions, 155mm: 106th

Western Islands
Ie Shima, etc.: 77th Infantry ("Statue of Liberty") Division (20,981 officers and enlisted) Embarked in Task Group 51.1
 * Division Commander: Major General Andrew D. Bruce, USA
 * 306th Infantry Regiment – landed 17 Apr (Green Beach)
 * 305th Infantry Regiment – landed 17 Apr (Red Beaches 1 & 2)
 * 307th Infantry Regiment – landed 17 Apr (Red Beaches 3 & 4)
 * Field Artillery Battalions, 105mm: 304th, 305th, 902nd
 * Field Artillery Battalions, 155mm: 306th
 * One Marine BLT

Thirty-second Army
Lieutenant General Mitsuru Ushijima (seppuku 22 June) Approx. 67,000 men under arms, incl. 5,000 Okinawan conscripts
 * 24th Division
 * Lt. Gen. Tatsumi Amamiya (KIA 30 June)
 * 22nd Infantry Regiment
 * 32nd Infantry Regiment
 * 89th Infantry Regiment
 * 62nd Division
 * Lt. Gen. Takeo Fujioka (suicide 22 June)
 * 63rd Brigade
 * 67th Brigade
 * 44th Independent Mixed Brigade
 * Maj. Gen. Suzuki Shigeji (died 22 June)