Peleliu and Iwo Jima
When the 1st Marine Division, on 15 September 1944, attacked the heavily defended island of Peleliu in the Palau group, the 16th Field Depot supported the assault troops. The field depot included two African-American units, the 11th Marine Depot Company and the 7th Marine Ammunition Company. The 11th Marine Depot Company responded beyond the call of duty and paid the price, 17 wounded, the highest casualty rate of any company of African-American Marines during the entire war. Major General William H. Rupertus, who commanded the 1st Marine Division, sent identical letters of commendation to the commanders of both companies, praising the black Marines for their "whole hearted cooperation and untiring efforts" which "demonstrated in every respect" that they "appreciate the privilege of wearing a Marine uniform and serving with Marines in combat."
Black combat support units also took part in the assault on Iwo Jima, where, as at Peleliu, their presence confounded the policy of segregation. Because of the random intermingling of white and black units, an African-American Marine, carrying a box of supplies, dived into a shell hole occupied by white Marines, one of whom gave him a cigarette before he scrambled out with his load and ran forward. Here, too, black stewards and members of the depot and ammunition companies came to the aid of the wounded. A white Marine, Robert F. Graf, who lay in a tent awaiting evacuation for further medical treatment, remembered that: "Two black Marines . . . ever so gently . . . placed me on a stretcher and carried me outside to a waiting DUKW."
At Iwo Jima, the 8th Marine Ammunition Company and the 33d, 34th, and 36th Marine Depot Companies served as part of the shore party of the V Amphibious Corps. Elements of the ammunition company and the 36th Depot Company landed on D-Day, 19 February 1945, and within three days all the units were ashore, braving Japanese fire as they struggled in the volcanic sand to unload and stockpile ammunition and other supplies, and move the cargo inland. Eleven black enlisted Marines and one of the white officers were wounded, two of the enlisted men fatally.
I believe they were officially called “stevedores”...