In 1965 the large, loud, and highly visible tanks of 3rd Platoon, B Company, 3rd Tank Battalion landed across a beach near Da Nang, drawing unwelcome attention to America’s first, almost covert, commitment of ground troops in South Vietnam. As the Marine Corps presence grew inexorably, the 1st and 3rd Tank Battalions, as well as elements of the reactivated 5th Tank Battalion, were committed to the conflict. For the United States Marine Corps the protracted and bloody struggle was marked by controversy, but for Marine Corps tankers it was marked by bitter frustration as they saw their own high levels of command turn their backs on some of the hardest-won lessons of tank-infantry cooperation learned in the Pacific War and in Korea.