a nickname for a french soldier is 'frenchy'
Aussie is a nickname for a person from Australia. The capital of Cameroon (or Cameroun, in French) is Yaoundé.
A Spanish soldier is called a Red Coat
Digger
A GI is a nickname for a soldier. So, your question is asking what a soldier helped a soldier to do.
DEMOB.
The nickname for the Australian mens water polo team is the Aussie Stingers
Bluebelly
The rude nickname was Bluebelly
Yankee or Bluebelly.
Christopher "Kit" Carson was a trapper, soldier and American frontiersman but I am unable to locate how he came to have the nickname Kit.
Great Briton