Engineer Special Brigades were amphibious forces of the United States Army developed during World War II. Initially designated engineer amphibian brigades, they were redesignated engineer special brigades in 1943. The 1st, 5th, and 6th Engineer Special Brigades were assigned to the European Theater of Operations. The 1st Engineer Special Brigade participated in the landings in Sicily and Italy before joining the 5th and 6th Engineer Special Brigades for the invasion of Normandy.