By Frank G. Hoffman Joint Force Quarterly 97 March 31, 2020 — Download PDF Dr. Frank G. Hoffman is a Distinguished Research Fellow in the Center for Strategic Studies, Institute for National Strategic Studies, at the National Defense University. By the end of the 19th century, the study of strategy had become routine for practitioners, but of little interest for theorists. By the end of the 20th century, it had become a matter of endless fascination for theorists, but a puzzle for practitioners.