 The 4 OG is a direct descendant of the World War II 4th Fighter Group, the United States Army Air Forces VIII Fighter Command unit formed from the members of the Royal Air Force (RAF) Eagle Squadrons.These fighter squadrons of the Royal Air Force formed prior to the United States entry into World War II with volunteer pilots from the United States.When the United States entered the war these units, and the American pilots in them, were transferred to the United States Eighth Air Force, with the RAF Nos.