The Merchant Ship Fighter Unit (MSFU) was a Royal Air Force operational aircraft unit based at RAF Speke during World War II. The aircraft operated by the MSFU were Hawker Sea Hurricanes. These planes were operated from 35 merchant ships outfitted with a catapult on the bow, referred to as Catapult Aircraft Merchant ships CAM ships. The MSFU was formed at Speke on May 5, 1941 and provided detachments to the CAM ships, each vessel being equipped with one Sea Hurricane plus an RAF pilot and support crew. CAM fighters were credited with seven Luftwaffe kills and numerous scare offs.