Its military functions continued to develop during the interwar period , with the building of large hangars and accommodation for Royal Air Force ( RAF ) personnel .
Later it became Royal Air Force with effect from Monday 1 April 1918 .
Its military functions continued to develop during the interwar period , with the building of large hangars and accommodation for Royal Air Force ( Royal Air Force ) personnel .
Later it became Royal Air Force with effect from Monday 1 April 1918 .