Operation Dewey Canyon was the last major offensive by the United States Marine Corps during the Vietnam War. It took place from January 22 through March 18, 1969 and involved a sweep of the North Vietnamese Army (NVA)-dominated A Shau Valley by the 9th Marine Regiment reinforced by elements of the 3rd Marine Regiment.
The 56 days of combat were a tactical success but did not stop the overall flow of North Vietnamese men and matériel into South Vietnam. The 9th Marine Regiment and attached units were awarded the Army Presidential Unit Citation for their actions in Operation Dewey Canyon.
Read more about Operation Dewey Canyon: Background, Operation, Outcome and Legacy
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