when was the rank of corporal established in the marine corps
Corporal The history of the rank of corporal in the USMC roughly parallels that of the U.S. Army until 1942. From 1775 until WWII, the Marine Corps used essentially the same rank and organizational structure as its common British and colonial forebears with the Army, as well as the later Continental and U.S. armies. In 1942, as the Army modified its triangular division infantry organization to best fight in the European/North African/Middle Eastern Theatre the Marine Corps began modifying the triangular division plan to best employ its amphibious warfare doctrine in the Pacific Theatre. This meant that for the Corps, squad leaders would remain as sergeants and that the rifle squad would be sub-divided into three four-man fire teams each led by a corporal.