Assigned to the Mobile Riverine Force (MRF) (after May 1967), initially designated Mekong Delta Mobile Afloat Force, and later the Riverines. This joint US Army and US Navy force comprised a substantial part of the brown-water navy. It was modeled after lessons learned by the French experience in the First Indochina War and had the task of both transport (of soldiers and equipment) and combat. The primary base was at Đồng Tâm Base Camp, with a floating base at the base of the Mekong River. MRF played a key role in the Tet Offensive.