In the Vietnam War, the Mobile Riverine Force (MRF) (after May 1967), initially designated Mekong Delta Mobile Afloat Force, and later euphemistically the Riverines, were a joint US Army and US Navy force that 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 Dong Tam, with a floating base at the base of the Mekong River. It played a key role in the Tet offensive.