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You can watch Airboss IV: The X Factor (2000) for free on Plex.

During a training exercise Frank White and his team are ambushed by former Soviet soldiers. Frank is kidnapped and a North Korean scientist attempts to brainwash him while his team tries to locate him. Later Frank has to go undercover with a group of eco terrorists to protect his commanders daughter who has joined the group. Frank realizes that there is a traitor in the group and must try to find out who it is, while finding the group is suspecting him.