You will be given a context, a subject and a relation. Your task is to generate a question based on the subject and relation. The generated question should include the given subject. Try to use a minimum number of words that are not present in either context, subject or relation while generating question.

Context : Josef Kammhuber was born in Tüßling, Bavaria, the son of a farmer. 
Subject : Josef Kammhuber 
Relation : military branch
With which military branch did Josef Kammhuber serve with?