Joeckel took a leave of absence from 1917–1919 and served as operations officer with the American Expeditionary Forces, 363rd Infantry of the United States Army during the Allied Forces’ campaign against the Germans in World War I; he achieved the rank of captain.
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During their time in Hanoi the OSS officers and their team met with Ho Chi Minh and although Swift did not speak French as Patti did he also met with Ho Chi Minh on at least one occasion.