During the first World War, in addition to his many commissions for magazine covers and men's fashion advertisements, J. C. also painted recruitment posters for the United States military and the war effort.
第一次世界大戦の間、多くの雑誌のカバーと男性ファッション広告の依頼に加えて、J.C.は合衆国軍と戦争協力のための勧誘ポスターも描いた。