NOTE: The source for some of the following definitions ...

There were also separate infantry brigades functioning in the Vietnam War. The 11th, 196th, and 198th Infantry Brigades fought in the war until 1967, when they were brought together to reconstitute the Americal Division, or the 23rd Infantry. The 199th Infantry Brigade and the 173rd Airborne Brigade continued to fight as independent entities. ................
................