Messerschmitt Bf 109 11 July 1938 when Erhard Milch finally allowed Willy Messerschmitt to acquire the company. All Messerschmitt aircraft that originated after that date, such as the Me 210, were to carry the "Me" designation. Despite regulations by the RLM, wartime documents from Messerschmitt AG, RLM and "Luftwaffe" loss and strength reports continued to use both designations, sometimes even on the same page. All extant airframes bear the official "Bf 109" designation on their identification plates, including the final K-4 models. The aircraft was often referred to by the folk-designation, 'Me 109', particularly by the Allies. The aircraft was often nicknamed "Messer"
Messerschmitt Bf 109 ace in the North African Campaign, who achieved 158 aerial victories. It was also flown by several other aces from Germany's allies, notably the Finn Ilmari Juutilainen, the highest scoring non-German ace on the type, and pilots from Italy, Romania, Croatia, Bulgaria and Hungary. Through constant development, the Bf 109 remained competitive with the latest Allied fighter aircraft until the end of the war. By the end of the war, a significant fraction of Bf 109 production originated in concentration camps, including Flossenbürg, Mauthausen-Gusen, and Buchenwald. During 1933, the "Technisches Amt" (C-Amt), the technical department of the "Reichsluftfahrtministerium" (RLM) ("Reich