Number 54 Squadron (sometimes written as No. LIV Squadron) is a squadron of the Royal Air Force based at RAF Waddington, Lincolnshire. On 1 September 2005, it took on the role of Intelligence, Surveillance and Reconnaissance (ISR) Operational Conversion Unit, and is currently responsible for training all RAF crews assigned to the MQ-9A Reaper, Shadow R1/R2, RC-135W Rivet Joint and Poseidon MRA1. It also controls the RAF ISR Warfare School (ISRWS) who run the Qualified Weapons Instructor Intelligence, Surveillance and Reconnaissance (QWI ISR) and QWI Reaper Courses. The squadron was previously a SEPECAT Jaguar strike fighter unit, based at RAF Coltishall, Norfolk, from April 1974 until it was disbanded on 11 March 2005. History World War I No. 54 Squadron was formed at Castle Bromwich on 5 May 1916. Like many others formed at the same time, was tasked with Home Defence duties flying BE2Cs and Avro 504s. Four months later, however, it re-equipped with Sopwith Pups, being the first Royal Flying Corps Squadron to operate the Pup. It moved to France as a day fighter squadron in December 1916. It was initially used as for bomber escort, claiming its first kill, an Albatros D.III, in April 1917, but specialised in attacking enemy observation balloons during the Battle of Arras. The Pup soon became outclassed in air combat, however, and No. 54 concentrated on ground attack missions until it could re-equip with Sopwith Camels in December 1917, allowing to return to fighter duties, providing protection for Army co-operation squadrons. The German spring offensive saw a return to low level attack missions, carrying out both ground attack and fighter missions until the end of the War. In February 1919, the Squadron returned to RAF Yatesbury, reduced to cadre status and was disbanded on 25 October 1919. Between the wars The Squadron was reformed at RAF Hornchurch on 15 January 1930 as a fighter squadron equipped initially with dual-control Siskin Trainers until Bristol Bulldog fighters were received in April that year. The squadron had a brief stay at RAF Upavon in 1931, prior to returning to RAF Hornchurch. The Bulldogs were replaced by Gloster Gauntlets, in September 1936 and Gladiators in April 1937, before the Squadron's first monoplane, the Supermarine Spitfire, arrived in March 1939. World War II The early days of World War II were spent patrolling the Kent coast until, in May 1940, the unit provided air cover for the