The armed forces command structure was changed by Hitler in 1938, with an Armed Forces HQ (the "Oberkommando der Wehrmacht", usually contracted to "OKW") placed over the army command ("Oberkommando des Heeres" or "OKH") and the other service commands and almost entirely displacing the Reich War Ministry. However, OKW from its inception had generally weaker, more pliant staff officers than OKH and the Luftwaffe. A weakness of both the "Kriegsakademie" curriculum and General Staff doctrine was that it focused primarily on tactical and operational matters. There was no institution comparable to the United States National War College or the British Imperial Defence College where higher-ranking officers of all services could study wider economic, political and diplomatic issues related to broad strategy.