Hermann Göring, Max Immelmann and the master aerial tactician Oswald Boelcke (the latter pair were the first to be awarded the Pour le Mérite, the highest decoration for gallantry for officers in the German Empire: simultaneously, on 12 January 1916, after shooting down eight Allied aeroplanes each). The award to Immelmann may have caused the decoration to acquire its popular nickname, the "Blue Max". With more and more pilots reaching this mark the required air victories were steadily increased to about 30 in 1918. In total 76 airmen were awarded the Pour le Mérite. 69 airmen received the "Goldenes Militär-Verdienst-Kreuz" (Military Merit Cross), the highest Prussian bravery award for non-commissioned officers and enlisted men. Among them were Gottfried Ehmann, the highest scoring air gunner of the war (12 victories). About 391 German pilots are credited with shooting down at least five Allied aircraft. Insignia German and Austro-Hungarian military aircraft at first used the cross pattée insignia, most often known in German as the , for the Prussian military medal. The , a black Greek cross on white, replaced the earlier marking from late March 1918 (especially in early April — Richthofen's last Dr.I, 425/17, was changed over just before he was killed), although the last order on the subject, standardising the new national marking, was dated 25 June 1918. Final year Between January and September 1918 German pilots shot down 3,732 Allied planes while losing 1,099 aircraft. By the end of the war, the German Army Air Service possessed a total of 2,709 frontline aircraft, 56 airships, 186 balloon detachments and about 4,500 flying personnel. After the war ended in German defeat (→ Armistice of 11 November 1918), the service was dissolved completely on 8 May 1920 under the conditions of the Treaty of Versailles (Article 198), which demanded that its aeroplanes be completely handed over to the Allies (Art. 202). Statistics German casualties totalled 4,579 aircrew and 299 ground personnel killed, 1,372 missing/prisoner and 5,123 wounded, along with 1,962 men killed in flying accidents in Germany. Material losses by enemy action were 3,126 aircraft, 546 balloons and 26 airships. Although adding up all of the confirmed kills by allied aces, gives a total of a little under 5,000 German aircraft destroyed, as well a 600 observation balloons to just 3,000 allied planes and 370 observation balloons. According to other sources, the Luftstreitkräfte shot down 7,783 allied aircraft (7,425 Western