327AIR was redesignated as HHC, 2d Battalion, 327th Infantry, assigned to the 101st Airborne Division (organic elements concurrently constituted) and activated on 3 February 1963, also as an element of the 1st Brigade, 101st Airborne Division. Vietnam As elements of the 1st Brigade, the 1st and 2nd Battalions 327th Infantry deployed to South Vietnam on 29 July 1965, where they were joined by the rest of the division in late 1967. In November 1965 Major David Hackworth organized Tiger Force a platoon-sized long-range reconnaissance patrol unit within the 1st Battalion. Tiger Force was later accused of extensive war crimes against South Vietnamese civilians. In October 1968 the 1st Battalion was awarded the Presidential Unit Citation by President Lyndon B. Johnson. On 28 November 1971 a CH-47 carrying five crew and 28 soldiers from the Regiment on a flight from Da Nang to Phu Bai Combat Base crashed into high ground, killing all aboard. The 2nd Battalion was the last unit of the 101st Airborne to leave Vietnam, departing in April 1972, making it the longest serving unit in combat during the Vietnam War. Post-war reorganization During the early 1980s the army adopted a battalion rotation program that paired combat battalions based in the continental United States with those stationed overseas. As part of this program, the lineage of the former Company C, 327AIR was redesignated on 21 January 1983 as HHC, 3d Battalion, 327th Infantry, and assigned to the 1st Brigade, 101st Airborne Division (Air Assault). This was accomplished by reflagging the existing 2nd Battalion, 502nd Infantry. In Alaska the existing infantry battalions of the 172nd Infantry Brigade were reflagged as the 4th, 5th and 6th Battalions, 327th Infantry, with the three "C" companies' back on airborne status, thus reactivating the lineages of the former companies D, E, and F, 327AIR. The rotational program was later abandoned and the Alaska-based battalions were reflagged again, leaving only the Fort Campbell-based battalions with 327th designations. When the 172nd Infantry Brigade (Separate) was inactivated and replaced by the newly re-activated 6th Infantry Division (Light) in 1986; the 4th, 5th and 6th Battalions, 327th Infantry were also inactivated and replaced by the 1st and 2nd Battalion, 17th Infantry (Fort Richardson, AK); and the 4th and 5th Battalion, 9th Infantry (Fort Wainwright, AK). Operation Desert Storm In 1990 the 1st BCT (including the 1st, 2nd and 3rd Battalions of the 327th) was deployed to Saudi