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In page Joseph P. O'Hara:

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O'Hara was born in Tipton, Cedar County, Iowa, on January 23, 1895. He attended the public schools and graduated from Spirit Lake, Iowa, High School. During the First World War, he was commissioned as a second lieutenant of the Infantry in the Officers’ Reserve Corps and later promoted to captain in the Quartermaster Corps, serving from May 13, 1917, to August 15, 1919. With overseas service, he was commissioned as a major of Infantry in the Reserve Corps.