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| Name: | John K. "Mac" MacArthur | Country: | United States | Rank: | Lieutenant | Service: | United States Air Service | Squadrons: | 27th Aero | Victories: | 6 | Born: | | Place of Birth: | Everett, Washington | Died: | 20 July 1918 |  | Place of Death: | |
| | | | An electrical engineer from Buffalo, New York, MacArthur joined the United States Air Service in 1917. On 17 July 1918, he scored his fifth victory and became the 27th Pursuit Squadron's first ace. Three days later, MacArthur and two other pilots were lost when his patrol encountered a storm. |
| Distinguished Service Cross (DSC) |
| "Outnumbered and handicapped by his presence far behind the German lines, he and three flying companions fought brilliantly a large group of enemy planes, bringing down or putting to flight, all in the attacking party, while performing an important mission near Luneville, France on 13 June 1918." DSC citation |
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