Seegee:
I recently read a fiction story about the Foreign Legion during WW II, which informed me about something I was previously unaware of. The legion split allegiances during the war. Some of them fought for the Vichy French and others sided with DeGaulle's resistance which was on the allied side. There was a battle fought between two sides of the legion in Africa, it is the only time in the organisation's history that they have ever fought each other.
Thousands of Frenchmen also fought for the Germans on the eastern front, many (although not all) of them as members of the S.S. Charlemagne Division, which ended up being pretty much wiped out helping defend Berlin against overwhelming Soviet forces in April of 1945.
When French Foreign Legion units defending the Bir Hachem strongpoint in north Africa surrendered to the Afrika Korps in June of '42, German general Erwin Rommel, the famed 'Desert Fox,' ignored a directive from Adolf Hitler to summarily execute German members of the Foreign Legion contingent for committing treason.
AFAIK, anyone wearing a French uniform would've had no official status as a combatant at that time since France was formally at peace... --C.K.