Yep, you are correct...I was in Can Tho and worked along the Bassac and Mekong rivers. Never got further north.
it was all VC and NVA in my AO...
Soviet Involvement in the Vietnam War
I spent a year in Danang (1967-68) including during the Tet Offensive. The Soviets are like the NVA and the Ukrainian "insurgents" are similar to the VC. The Soviets and the Chinese armed both of them.