Throughout the Vietnam War, the troopers of 1st Squadron, 4th Cavalry Regiment participated in numerous battle and operations including; Operation Niagara, Operation Cedar Falls, Operation Williston, Operation Tucson-Delta, Operation Junction City, Operation Manhattan, Operation Shenandoah II (where Troop C handed the VC one of their heaviest defeats of the war), the Tet Offensive, and many more in numerous small villages along the Cambodia-South Vietnam border, and throughout South Vietnam. Meanwhile, Troop D provided helicopter support for the 1st Infantry Division, and acted as air cavalry, a new concept in the Army. The 1st Squadron participated in eleven campaigns of the Vietnam War from 20 October 1965 to 5 February 1970. The 1st Squadron was awarded the Presidential Unit Citation for its heroism in Binh Long Province as well as a Valorous Unit Award for Binh Doung Province. Troop A, 1st Squadron received a Valorous Unit Award for its actions at the battle of Ap Bau Bang.