Four of the six battalions of the 77th Artillery Regiment were assigned to or in direct support of multiple Divisions during the Vietnam War. The three (3) 105mm howitzer batteries of the 1st Battalion rotated direct support among the 3 Brigades (9 Cavalry Battalions) of the 1st Cavalry Division. The 2nd Battalion's 105mm howitzers supported the 4th and 25th Infantry Divisions during their tour of duty in Vietnam. In 1986, they were sent to Germany as part of the 41st FA Group in Babenhausen. The 3rd Battalion was a World War I & II Battalion, transferred to the Army Reserve, and then inactivated 31 December 1965 in Van Nuys, California. The 4th Battalion, an Aerial Rocket Artillery unit, was assigned to direct support of the 101st Airborne Division. Post Vietnam, it was sent to Germany and was at the Babenhausen Kaserne as was the 2nd and 5th Battalions. The 5th Battalion was active in WW I and II and a cold war Sargeant Missile unit of the 36th FA Group on the Babenhausen Kaserne in Germany during the Vietnam War. It was inactivated in 1973 and the Kaserne was closed in June 2007. Finally, the 6th Battalion provided 155mm howitzer and Aerial Rocket Artillery support to the 9th and 25th Infantry Divisions in Vietnam. It was activated as Battery F, 77th Artillery in Vietnam on 30 April 1971 as an aerial rocket artillery battery in support of the 3rd Brigade, 1st Cavalry Division at Bien Hoa. The battery was inactivated in Vietnam on 12 August 1971 and remains inactive on Army rolls today as Battery F.