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He served the German Empire first as an artilleryman, then as an aerial observer for artillery, as a fighter pilot, and finally as the Staffelführer of a fighter squadron.
Gilly flew his first combat sortie on 17 November 1917 over Spresiano; his rear seat aerial observer somehow went overboard at 2,500 meters altitude.
Petty Officer Shoji Okuda, served as an aerial observer in the Imperial Japanese Navy on a floatplane Yokosuka E14Y that was launched from a long-range submarine aircraft carrier, the I-25.