During World War I on 8 October 1914, the British Royal Flying Corps (RFC) arrived in Saint-Omer and a headquarters was established at the aerodrome next to the local race course. For the following four years, Saint-Omer was a focal point for all RFC operations in the field. Although most squadrons only used Saint-Omer as a transit camp before moving on to other locations, the base grew in importance as it increased its logistic support to the RFC. Many Royal Air Force squadrons can trace their roots to formation at Saint-Omer during this period. Among which are No. IX Squadron RAF which was formed at Saint-Omer, 14 December 1914 and No. 16 Squadron RAF which was formed on 10 February 1915.