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According to Ernest Hemingway - Biographical on Nobelprize.org, Hemingway saw combat when he was a teenager. It says:
After the United States entered the First World War, he joined a volunteer ambulance unit in the Italian army. Serving at the front, he was wounded, was decorated by the Italian Government, and spent considerable time in hospitals ....
[other sources, quotes, explanations, etc. necessary to complete the answer]
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