Sampan

The Sampan is a barge used by the NVA and Vietcong in Black Ops. They make a brief appearance in Multiplayer map Cracked, many of them are staioned in where the SOG team spawns, possybly hinting where they arrived

In Singleplayer
The Sampan first appears in The Defector, after jumping into the PBR, the player can see some Sampans.

After playing the following levels, again it appears in Victor Charlie, in which many VC fighters attack the player, in the beginning of the level, you get an M1911 and kill 3 Vietcong in a Sampan, afterwards, Mason uses a VC as a human sheld in a Sampan. After this firefight, lots of Sampans appear too.

In Crash Site, it appears the Sampans are more equipped, with at least 1 RPG on board, but don't worry, they aren't as lethal as the ZSU air defence guns or 82mm mortars on ZiS-151 lorries. Once in the plane, VC fighters come in Sampans in which the player can destroy with his/her China Lake.