AI Mission or Co-op as it is more commonly referred to is a game mode where up to 5 human players must team up in order to complete specific objectives against legions of AI enemies. Co-op missions are only available in the Trainee and Regular Co-op servers. The completion of AI missions are the only way to receive exclusive gear and otherwise unobtainable weapons without the means of G coins. Due to the overwhelming amount of missions available, they are subdivided into missions, namely Scenario, AI Demolition, Riot, and PB: Rescue.