1st Provisional Marine Brigade
In the Korean War, they had about 4,725 men that had the 5th Marine Regiment's 1st, 2nd and 3rd battalions, 1st Combat Engineer Battalion, 1st Medical Battalion, 1st Motor Transport Battalion, 1st Ordnance Battalion, 1st Service Battalion, 1st Shore Party Battalion, 1st Signal Battalion, 1st Tank Battalion, 1st Amphibian Tractor Company, and 1st Combat Service Group. And they also had support from the Marine Aircraft Group 33.