Operation Union II was a military operation that took place in the Vietnam War. It was a search and destroy mission in the Que Son Valley carried out by the 5th Marine Regiment. Launched on May 26, 1967, the operation ended June 5. It was a bloody 10-day battle that resulted in 594 NVA killed and 23 captured, while U.S. casualties were 110 killed and 241 wounded. The Importance of the Que Son Valley in the Vietnam War The Que Son Valley is located along the border of Quang Nam and Quang Tin Provinces in South Vietnam's I Corps. Populous and rice-rich, the valley was viewed as one of the keys to controlling South Vietnam's five Northern provinces by the communists and by early 1967 at least two regiments of the 2nd Division of the People's Army of Vietnam had been infiltrated into the area. The 1st Battalion, 5th Marines (1/5) and 3rd Battalion, 5th Marines (3/5), experienced units that had fought in Vietnam since their arrival in the summer of 1966, were assigned to the valley in...
