Military Review, August 1967: Army Forces in Riverine Operations
....With US Army and Navy units beginning operations in the Mekong Delta, it might be helpful to examine some of the tactical concepts for riverine operations. These concepts are based on adapting today's tactical doctrine and equipment to the special operational requirements of a riverine environment, while benefiting both from the "lessons learned" from historical examples of riverine warfare and exploitation of new organizational, operational and material ideas...
...and published in 1969 by the Navy Dept's Naval History Division:

Riverine Warfare: The US Navy's Operations on Inland Waters