Why did Hemingway drive an ambulance for red cross?

Ernest Hemingway drove an ambulance for the Red Cross during World War I as a way to serve his country and support the war effort. He volunteered in 1918, motivated by a desire to help those affected by the conflict and to experience the realities of war firsthand. His experiences in the ambulance service significantly influenced his writing and shaped themes of courage, suffering, and the impact of war that would appear in his later works.