Chief Petty Officer Jeremy Gomez, left, a special boat operator and basic crewman training instructor, demonstrates a combat ascent to a student at Naval Amphibious Base Coronado. Students performed hull inspections on the rigid-hulled inflatable boat, looking for simulated cracks and holes while swimming with held breath. BCT is the first phase in the special warfare combatant-craft crewman training pipeline. SWCCs operate and maintain the Navy's state-of-the-art, high-speed boats used in support of SEALs in special operations missions worldwide.