World War One greatly shaped Hitler in ways that were both mundane and profound. He was wounded several times, scarred by Trench Warfare and Gassed twice. Hitler also fought in several brutal battles that left scars on his psych such as the First Battle of Ypres, the Battle of the Somme, the Battle of Arras and the Battle of Passchendaele.
Lets say Hitler's Regiment is sent to prop up the Ottoman Turks, he still distinguishes himself and earns the Iron Cross First Class and due to the nature of the fighting in the Middle East is actually Commissioned as a Leutant in 1917 and put in command of a Platoon of Turks as the situation deteriorates and ends the war as a Hauptmann in charge of a Company of Turks at Mosul.
How does this affect his future plans and thoughts...