Christian underwent pilot's training and graduated as a probationary
Flying Officer in
Bloody April 1917. However, because he was phobic about heights, he volunteered to serve as an aerial observer instead. He was posted to 6 Naval Squadron as an observer/gunner in Airco DH.9s and remained in the unit as it transformed into 206 Squadron of the Royal Air Force. Four months later, he began the victory tally that would run through 1 August 1918. He was awarded the Distinguished Flying Cross for his defensive valor during the 47 bombing raids that he flew. His Distinguished Flying Cross was gazetted on 21 September 1918: Lieutenant Leonard Arthur Christian (late R.N.A.S.) ==List of aerial victories==