During the Vietnam War, one of the 1st Marine Division's primary area of operation was the southern two provinces of I Corps - Quang Tin and Quang Ngai, located in the southern portion of South Vietnam's I Corps Military Region. Astride the boundary between Quang Nam and Quang Tin provinces is the populous, rice-rich Que Son Valley, considered as strategically important in controlling South Vietnam's five northern provinces. For that reason, it was a principal focus for the Marines in I...