Basic Crewman Training students huddle in a swimming circle in Mission Bay while being quizzed on navigation by their instructors as part of a low light and night navigation training exercise. BCT is the first phase in the Special Warfare Combatant-craft Crewman training pipeline. SWCCs operate and maintain the Navy's inventory of state-of-the-art, high-speed boats used to support SEALs in special operations missions worldwide.