Formed as a light bomber squadron in 1925, 603 Squadron became a fighter squadron in 1939. It fought in the Battle of Britain, Malta and elsewhere in the Second World War.
Personnel are required to be fit and robust and are recruited from Scotland, Northern Ireland and the North of England. Most training is conducted at weekends and during evenings, with an annual two-week training camp each year.
The Squadron has deployed personnel to all major RAF deployments in the last twenty years and routinely has personnel deployed world-wide.