Operation Market Time
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 South Vietnam United States
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 North Vietnam Viet Cong
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Operation Market Time was the United States Navy and South Vietnam’s effort to stop troops and supplies from flowing by sea from North Vietnam to South Vietnam during the Vietnam War. Also participating in Operation Market Time were United States Coast Guard Squadron One and Squadron Three.
Operation Market Time was one of six Navy duties begun after the Tonkin Gulf Incident, along with Operation Sea Dragon, Operation Sealords, Yankee Station, PIRAZ, and naval gunfire support.
When a trawler was intercepted landing arms and ammunition at Vung Ro Bay in northern Khánh Hòa Province on 16 February 1965 it provided the first tangible evidence of the North Vietnamese supply operation. This became known as the Vung Ro Bay Incident. Operation Market Time was established by the United States Joint Chiefs of Staff at the request of General William C. Westmoreland, commanding general of Military Assistance Command Vietnam. He requested that the U.S. Navy establish a naval blockade of the vast South Vietnam coastline against North Vietnamese gun-running trawlers. The trawlers, usually 100-foot-long Chinese-built steel-hulled coastal freighters, could carry several tons of arms and ammunition in their hulls. Not flying a national ensign that would identify them, the ships would maneuver “innocently” out in the South China Sea, waiting for the cover of darkness to make high-speed runs to the South Vietnam coastline. If successful, the ships would off load their cargoes to waiting Việt Cộng or North Vietnamese forces.
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Wikipedia