FO is Forward Observer. They usually spotted for artillery but also flew reconniasance. Most FO did not fly the aircraft. However there were some FO who did pilot the light L-3 and L-4 observation planes for field artillery supporting the infantry.
A good book to read a first-hand account of a FO Pilot is "Alone and Unarmed" by Kowalik.
George Bush was a fighter pilot in World War 2. And JF Kennedy was a naval officer during that war.
Ernst Udet flew in both wars. Herman Goering was a pilot during WW1 and was involved politically in WW2.
Hans Ulrich Rudel
George H. W. Bush was indeed a decorated fighter pilot during World War II, but there was no "Battle of Spain" during World War II. Spain was officially a non-belligerent nation in WW II.
Fighter Pilot Training.
He has little connection to WW 2. He was still a baby when the war ended. His father served valiantly as a navy pilot during this war.
American Pilot who flew for the fledgling Indonesian Air Force during the Indonesian Struggle for Independence.
George H. W. Bush was a Naval Pilot in WW II.
Dogas Bader, RAF Pilot
His nickname was 'Bubi'. Erich 'Bubi' Hartmann.
It differed between Air Forces, but was generally about a year in total
Yes he did. He was a fighter pilot. For a while during the Korean War, his wingman was the famous baseball player Ted Williams.