England, France, China, Belgium, Netherlands, Switzerland, Bahamas, Russia,
Poland.
Japan
Germany.
During World War 2, California was part of the United States, so any enemy of the U.S. would, by extension, have been an enemy of California. For example, Italy, Japan, or Germany.
Any pilot who shot down 5 or more enemy aircraft
Japan
Germany was Britain's main enemy.
They were not placed anywhere. Japan was not an enemy in World War I.
The question is unanswerable as asked since it does not define who the "enemy" is.
Germany and Japan
I would say Germany. Although Japan was a big enemy.
Russia.
ASDIC