Arthur_Crean
Arthur B. Crean was a master sergeant in the United States Army during World War I. He was the first United States armed forces member to be issued a service number and thus holds service #1 in the United States Army.
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When U.S. Army service numbers were discontinued in 1969, a report in the Des Moines Tribune noted that Master Sgt. Crean had been issued the number "ASN 1" on February 28, 1918. [1]