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[1] These same flags are in current use in the Turkish Armed Forces: Turkish General Staff.
Above - Mounted party carry a Corps Headquarters flag, before a group of mounted officers in WW1.
Right - Extracted from photographs made by the American Colony of Jerusalem in WW1 showing Turkish staff vehicles recognition insignia. This vehicle has on the wind screen a more elaborate set of insignia has been painted on the glass. This is the star and crescent quartered in red/white. Flanking this are two swallow-tail flags in red/white. These are Turkish army’s Corps Command flags.
Above - The Imperial War Museum collection has the Turkish flag from the Suez Canal attack, and this displays a distinctive crescent with four-point star. This same flag is seen in the German cartoon depicting the Turkish victory at Kut. In January 1915, a Turkish army attacked the Suez, and the four-point star and crescent flag:
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[1] This flag design is also very similar to the later revolution flag of Egypt from 1919. It bears a crescent and cross to demonstrate that both Muslims and Christians supported the Egyptian nationalist movement against British occupation.