Complete the following sentence: The Marines also played an important role in the Vietnam War at battles such as Da Nang, Huế, and Khe Sanh. Complete the following sentence: The Marines also played an important role in the Vietnam War at battles such as Da Nang, Huế, and Khe Sanh. Marines operated in the northern I Corps regions of South Vietnam and fought both a constant guerrilla war against the Viet Cong and an off and on conventional war against North Vietnamese Army regulars.<unk> Marines operated in the northern I Corps regions of South Vietnam and fought both a constant guerrilla war against the Viet Cong and an off and on conventional war against North Vietnamese Army regulars. Marines also conducted the less well-known Combined Action Program that implemented unconventional techniques for counterinsurgency warfare.<unk> Marines also conducted the less well-known Combined Action Program that implemented unconventional techniques for counterinsurgency warfare. Marine presence was withdrawn in 1971, but returned briefly in 1975 to evacuate Saigon and attempt to rescue the crew of the
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