No. 84 Squadron of the Royal Flying Corps (RFC) was formed on 7 January 1917 and moved to France in September 1917. It flew the SE.5 over the Western front, at one time based in Bertangles, France until it returned to the UK in August 1919.
The squadron was reformed on 13 August 1920 at Baghdad in Iraq, moving to Shaibah in September, where it remained for the next 20 years. Its initial equipment was DH.9As (until January 1929) and these were replaced by Wapitis (beginning October 1928), Vincents (December 1934) and Blenheims Mk.Is ( February 1939).