From the Foreword: "The story of the Marine Corps U.S. Special Operations Command Detachment, which became known as Det One, is an extraordinary tale. On its face, the story would not rate a minute's glance. One small group of Marines, about a hundred in number, formed, trained, and went to war. This all happened as the nation was 18 months into the Global War on Terrorism and as the Marine Corps was deploying I Marine Expeditionary Force in Operation Iraqi Freedom. Yet the story behind the basic facts is not only far more intricate and fascinating, with dramatic episodes and intrepid characters from the Pentagon to Camp Pendleton, it portended great significance for the Marine Corps. What makes the Det One story extraordinary is the shift in Marine Corps policy that brought it about, the maturation of the special operations capabilities of forward-deployed Marine expeditionary units that made it possible, and the patriotism, valor, fidelity, and abilities of the Marines and Navy Corpsmen who manned it. Although Det One has passed now into the history books, its legacy survives in the formation of Marine Corps Special Operations Command and in the lessons learned and experiences of its members, who now continue to serve in dozens of units. Lieutenant Colonel John P. Piedmont Marine Field Historian in Iraq in April 2004, saw the historical significance of Det One and decided to pursue its history as a project. Under the director of the History and Museums Division at the time, Colonel John W. Ripley, he was given permission to proceed with his collections with a view toward turning them into a monograph. What follows here is the culmination of his efforts, the product of two years' work, more than 60 interviews done in Iraq, Washington, D.C., Virginia, and California, and the collection of hundreds of documents."--Dr. Charles P. Neimeyer.

This is the fourth volume in an operational and chronological series covering the U.S. Marine Corps’ participation in the Vietnam War. This volume details the change in focus of the III Marine Amphibious Force (III MAF), which fought in South Vietnam’s northernmost corps area, I Corps. This volume, like its predecessors, concentrates on the ground war in I Corps and III MAF’s perspective of the Vietnam War as an entity. It also covers the Marine Corps participation in the advisory effort, the operations of the two Special Landing Forces of the U.S. Navy’s Seventh Fleet, and the services of Marines with the staff of the U.S. Military Assistance Command, Vietnam. There are additional chapters on supporting arms and logistics, and a discussion of the Marine role in Vietnam in relation to the overall American effort.

Includes more than 40 maps, plans and illustrations. This volume in the official History of the Marine Corps chronicles the part played by United States Marines in the Chosin Reservoir Campaign. The race to the Yalu was on. General of the Army Douglas MacArthur’s strategic triumph at Inchon and the subsequent breakout of the U.S. Eighth Army from the Pusan Perimeter and the recapture of Seoul had changed the direction of the war. Only the finishing touches needed to be done to complete the destruction of the North Korean People’s Army. Moving up the east coast was the independent X Corps, commanded by Major General Edward M. Almond, USA. The 1st Marine Division, under Major General Oliver P. Smith, was part of X Corps and had been so since the 15 September 1950 landing at Inchon. After Seoul the 1st Marine Division had reloaded into its amphibious ships and had swung around the Korean peninsula to land at Wonsan on the east coast. The landing on 26 October 1950 met no opposition; the port had been taken from the land side by the resurgent South Korean army. The date was General Smith’s 57th birthday, but he let it pass unnoticed. Two days later he ordered Colonel Homer L. Litzenberg, Jr., 47, to move his 7th Marine Regimental Combat Team north from Wonsan to Hamhung. Smith was then to prepare for an advance to the Manchurian border, 135 miles distant. And so began one of the Marine Corps’ greatest battles—or, as the Corps would call it, the “Chosin Reservoir Campaign.” The Marines called it the “Chosin” Reservoir because that is what their Japanese-based maps called it. The South Koreans, nationalistic sensibilities disturbed, preferred—and, indeed, would come to insist—that it be called the “Changjin” Reservoir.