 The 6th, formed when the 172nd Infantry Brigade was expanded to a division, was inactivated during the post-Cold War draw down and reverted again to the 172nd Infantry Brigade (United States).The 1st Bn (Abn), 501st Inf was made a separate battalion combat team for a short period of time, around which the 4th Brigade (Airborne), 25th Infantry Division was constructed, where it serves to this day.Of the three original parachute regiments organic or attached to the 101st Airborne Division in World War II, the 501st remains as the only unit on jump status.