During which war did Corporal Eugene Bullard serve as a pilot?

Corporal Eugene Bullard served as a pilot during World War I. He is notably recognized as the first African American military pilot. Bullard flew for the French Air Service, as he had moved to France and enlisted in the French Foreign Legion after the United States entered World War I. His contributions were significant, and he became well-respected for his flying skills, combat experience, and courage. The other options refer to wars that occurred after Bullard's service; therefore, they do not apply to his historical contributions as a pilot. World War I was the conflict during which he made his mark in aviation and military history.