 66 Squadron was a Royal Flying Corps and eventually Royal Air Force aircraft squadron.It was first formed at Filton on 30 June 1916 as a training squadron equipped with Royal Aircraft Factory BE2, BE12s and the Avro 504.The squadron received its first Sopwith Pup  on 3 February 1917, and deployed to Vert Galand in the Somme, France on 12 March 1917.