Korean Marines during the Vietnam war.
The South Korean government, under the administration of Park Chung-hee, took an active role in the Vietnam War. From September 1964 to March 1973, South Korea sent some 350,000 troops to South Vietnam.
The South Korean Army, Marine Corps, Navy, and Air Force all participated as an ally of the United States. The number of troops from South Korea was much greater than those from Australia and New Zealand, and second only to the U.S. military force for foreign troops located in South Vietnam.
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This is an excellent reminder; a USMC exchange officer I knew had been attached to a Korean Marine battalion in Vietnam as a junior officer. He had an extremely high regard for them. Interestingly a law enforcement type once confided that he thought Korean organized crime were the toughest group he knew of.