Question: What division of the American armed forces fought the Imperial Japanese Army, also know as the "Dai-Nippon Teikoku Rikugun", or "Army of the Greater Japanese Empire", at Bougainville during World War Two?
Sentence (from "Imperial Japanese Army"): The Imperial Japanese Army (IJA; 大日本帝國陸軍 "Dai-Nippon Teikoku Rikugun"; "Army of the Greater Japanese Empire") was the official ground-based armed force of the Empire of Japan from 1868 to 1945.
Relevant evidence: Yes