 | First Marine Division Activated on Feb. 1, 1941, was the first Division in USMC history. It included the 1st, 5th, & 7th Marine Infantry Regiments and the 11th Artillery Regiment. Moved to the Pacific theater in April 1942. Fought on Guadalcanal, Western New Britain, Peleiu, and Okinawa. Following the Japanese surrender the Division served on occupation duty in China. |
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 | Second Marine Division Activated on 1 Feb. 1941. It included the 2nd, 6th, & 8th Marine Infantry Regiments and the 10th Artillery Regiment. Elements of the Division were tasked to Defense Battalion duty in Iceland in July 1941. The Division served on Guadalcanal, Tulagi, Gavutu and the Florida Islands. Okinawa and occupation duty in Japan. |
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 | Third Marine Division Activated on 16 Sept. 1942, the Third Division included the 3rd, 9th, 21st & 23 (replaced by the 3rd in June '43) Marine Infantry Regiments, and the 12th Artillery Regiment. Action on Bougainville, Saipan, Guam, Iwo Jima. Occupied Truk and Chichi Island at wars end. |
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 | Fourth Marine Division Activated on 16 Aug. 1943. Composed of the 23rd, 24th and 25th Marine Infantry Regiments and the 14th Artillery Regiment. Saw action on Roi & Namur Islands, Saipan, Tinian and Iwo Jima. |
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 | Fifth Marine Division Activated 21 Jan. 1944. Included the 26th, 27th, and 28th Marine Infantry Regiments and the 13th Artillery Regiment. Served on Iwo Jima, (A squad of the 28th raised an American flag on Mt. Suribachi and was captured on film by Rosenthal. An image which has become synonymous with the Corps ever since.) After the surrender, served in Japan on occupation duty. |
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 | Sixth Marine Division Activated 7 Sept. 1944. Composed of the 1st Provisional Brigade, 4th, 22nd, & 29th Marine Infantry Regiments and the 15th Artillery Regiment. Stood up on Guadalcanal with manpower made available due to the activation and service of the USMC Woman's Reserve. Action at Engebi, Eniwetok, Guam Saipan and Okinawa. Occupation duty in Japan. |