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Rank: First Lieutenant
Unit: United States. Army. Infantry, 339th. Machine Gun Company.
Description of Costello in Signal Corps photo caption (#39154, not in BHL collection): "1st Lieut. Harry Costello, Machine Gun Co. 339th Regt. Inf. American awarded Military Cross by British Government. His home address is 387 Union Avenue, Bridgeport, Connecticut. For five years Lt. Costello was teacher and athletic director at University of Detroit. Archangel, Russia. Nov.2, 1918."
•Charles E. Lewis papers, 1917-1958 (scattered)
•The history of the American expedition fighting the Bolsheviki; campaigning in north Russia 1918-1919
•History of the 339th Regiment of Infantry, 1917-1926 (with who's who in and roster of the regiment)
•The Polar Bear, vol. 3, no. 1 (Feb. 1927).
•United States. Army. Signal Corps photograph collection