Above: 3 February 1968: Hue City, North Vietnam, Tet Offensive, Phase 1. U.S. Marine with his M60 scans the streets and rooftops for NVA snipers. Note the marine's helmet worn backwards, allowing better visibility. Photo source: Archives Branch, USMC History Division. (Click to enlarge)

Left: U.S. Marines advance past an M48 Patton tank during the battle for Huế. Photograph in the Public Domain. 

58,281 U.S. Servicemen died in the Vietnam War; 47,434 from combat. 303,644 American servicemen were wounded; 150,341 did not require hospitalization (source: U.S. National Archives). North Vietnamese and Viet Cong dead or missing ranges from 666,000 to 950,765 (sources: Lewy, Guenter (1978). America in Vietnam. Oxford University Press. ISBN 978-0-19-987423-1. Hirschman, Charles; Preston, Samuel; Vu, Manh Loi (December 1995). "Vietnamese Casualties During the American War: A New Estimate" (PDF). Population and Development Review. 21 (4): 783. doi:10.2307/2137774. JSTOR 2137774.). 

Multimedia: Video, Web, and Photo
Photo Album: Marines fighting at the Battle of Hue (29 photos)   |  Video: History Channel: Tet Offensive 1968

Left: U.S. Marines move through the ruins of the hamlet of Dai Do after several days of intense fighting. Photograph in the Public Domain. 

June to October 1968: The 3d Marine Division, now under Major General Raymond G. Davis, undertook an aggressive counteroffensive against North Vietnamese forces in the northern border section below the DMZ. Significance: Employing new helicopter mobile and firebase tactics and no longer confined to securing defensive outposts, the 3d Marine Division swept the 320th NVA Division out of its forward positions in South Vietnam. Source: Marine Corps University.

Left: Quang Tri Province, Vietnam; May 2019. CH-46 Sea Knight helicopter on display at the former site of Khe Sanh Combat Base, 17th parallel. Photograph licensed to War History Network.

Books and Suggested Reading
There are many excellent works on the Vietnam War; those that provide a strong overview and interest include Vietnam: An Epic Tragedy, 1945-1975 by Max Hastings (HarperCollins, 2018); Hue 1968: A Turning Point of the American War in Vietnam by Mark Bowden (Atlantic Monthly Press, 2017); The Cat From Hue: A Vietnam War Story by John Laurence (Public Affairs Publishers, New York, 2002); and winner of the Pulitzer Prize: Embers of War: The Fall of an Empire and the Making of America's Vietnam by Fredrik Logevall (Random House New York, 2012).