After Immelmann's death, Boelcke was withdrawn from combat on 27 June 1916, while he was the war's leading ace, and assigned to Fliegertruppe (Flying Troops) headquarters. His reassignment was in line with the German military doctrine of Auftragstaktik, or order tactics: The belief that the junior officer on the battlefield best knows the tactics needed there. As part of his staff duties revamping the Fliegertruppe into the Luftstreitkräfte (Air Force) in early October 1916, Boelcke wrote the Dicta, which was then distributed throughout the Luftstreitkräfte as the world's first tactical manual.