Task: Question Generation
Input (English): Context : Tad J. Oelstrom (born February 14, 1943) is a retired United States Air Force Lieutenant General who now serves as the Director of the National Security Program at the John F. Kennedy School of Government, Harvard University. 
Subject : Tad J. Oelstrom 
Relation : military branch
Output (English): With which military branch did Tad J. Oelstrom serve with?