How did Frank Capra serve in the U.S. Army during World War I?

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Frank Capra served in the U.S. Army during the final year of World War I after receiving a commission from the Reserve Officers’ Training Corps. During this time, he was assigned to teach mathematics.1

It is important to note that this service occurred during World War I, distinct from his later service as a major in the Signal Corps during World War II, where he produced the Why We Fight documentary series.2