The first period above began in Vietnam in early 1966 with the creation of a provisional LRRP platoon by the 1st Cavalry Division; followed by the 1st Brigade, 101st Airborne Division; the 1st Infantry Division; and the 25th Infantry Division in June 1966.
The first period above began with the creation of provisional LRRP platoons by the 1st Brigade, 101st Airborne Division. The 1st Infantry Division and 173rd Airborne Brigade also formed rovisional LRRP units in April and the 25th Infantry Division in June 1966.