There is some debate about the c/n of this air frame. Preserved F938 is former G-EBIC and 687/2404 is given by CAA to G-EBIC. It may be the case that large parts of F938 in the RAF Museum and F937 (ex G-EBIB) in the Science Museum have been exchanged in the thirties, resulting in a mix-up of identity.
E5757 was delivered to 2 Sqn of the Australian Flying Corps. 2 Sqn officially 68 Sqn in the Royal Flying Corps to avoid confusion with The RFC's 2 Sqn. The Australians never accepted the RFC number and it was dropped early in 1918. The state library captioned the photo as Egypt, where 2 Sqn was formed in 1916. However it was on the Western Front when it received SE-5As at the end of 1917. Operated from airfields in France and Belgium. Squadron stayed in Europe until 1919. Photo from: State Library of Victoria
The US fiscal year-based serial system started in FY 1922. The AS prefix stood for Air Service. The Eberhart Steel Products Company from Buffalo, NY built about 50 SE.5s for the USAAS using British-made parts. Interestingly this airframe, as NC4488, was used in the filming of the war movie Hell's Angels and it survived to become G-BLXT in the UK. Photo from: San Diego Air & Space Museum