Brothers Karl and Wilhelm Allmenröder transferred to "Die Fliegertruppe" (Imperial German Air Service) on 16 March 1916. Karl Allmenröder was sent for training at Halberstadt. He flew two-seaters as an artillery spotter in "Flieger-Abteilung (Artillerie)" Detachment (Artillery) 227 before joining "Jagdstaffel 11" in November 1916. After Manfred von Richthofen assumed command in January, 1917, "Jagdstaffel 11" became one of the premier fighter squadrons of the German military. Allmenröder's career as a fighter ace was a short but spectacular string of single and double victories. He achieved his victories flying an Albatros D.III in the squadron's scarlet livery, with his personal markings of white nose and elevators. The Red Baron often chose Allmenröder as a wingman.