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 : Hans Lotter (17 November 1917 -- 21 November 2008) was a highly decorated Oberleutnant in the Luftwaffe during World War II, and a recipient of the Knight's Cross of the Iron Cross. 
Subject : Hans Lotter 
Relation : military branch
In what military branch did Hans Lotter serve?

Context : The Hanging Tree is a 1959 Technicolor film directed by Delmer Daves. 
Subject : The Hanging Tree 
Relation : director
The main director of The Hanging Tree was who?

Context : Stryker vehicles are produced by General Dynamics Land Systems for the United States Army. 
Subject : Stryker 
Relation : service entry

What year was Stryker introduced?