Honcho

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1940s: from Japanese hanchō ‘group leader’, a term brought back to the US by servicemen stationed in Japan during the occupation following the Second World War.

wiktionary

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American English, from Japanese 班長(hanchō, “squad leader”), from 19th c. Mandarin 班長 (bānzhǎng, “team leader”). Probably entered English during World War II: many apocryphal stories describe American soldiers hearing Japanese prisoners-of-war refer to their lieutenants as hanchō.

etymonline

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honcho (n.)

1947, American English, "officer in charge," from Japanese hancho "group leader," from han "corps, squad" + cho "head, chief." Picked up by U.S. servicemen in Japan and Korea, 1947-1953.