The Captain was the leader of an unknown mercenary organization, who was an ex-solider who was in the battle at the Liberian civil war in the 1990s.
The Captain had a sadistic personality and had no problem with killing a lot of people to get the job done. He also considered himself something of a cowboy looking for a good battle.
He and his crew were hired by Kageyama to retrieve a disk that contained information on Nuclear Weaponry. He had his men shoot everyone in the Yellow Flag, looking for the disk. Later when the Black Lagoon crew escapes to their boat he pursues them in his Mi-24 helicopter, shooting at them and forcing them up a river where they became cornered by a waterfall. The Lagoon crew turns their ship around and heads for the captain at full speed. Using a half-sunken boat as a ramp they shot at the captain's helicopter with the front tropedos. One misses, but the secound hits the Captain in the face, killing him, and causing the helicopter to crash.