You will be given a definition of a task first, then some input of the task.
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 : During the 1960s and 1970s a perception of Biggles as unacceptably racially prejudiced, especially considered as children's literature, drove the Biggles books from many public and school libraries.
Subject : Biggles
Relation : military branch
Output:
In what military organization did Biggles serve?