Who When Where

I am trying to locate any military records for George. He was an orphan as his parents George Jarvis and Marion Elizabeth (nee Dunn) had both died in 1916.

George was born on 15th August 1912 in Wanstead, Essex, England and died on 7th May 1976 in Kings Lynn, Norfolk, England. He married Elizabeth Kate Brown (1914-1984) on 28th August 1937 in Harborne, Birmingham, England.

Any help in this would be gratefully appreciated.