noun
sergeant first class
A specific rank in some military organizations, equivalent to sergeant first class. Used in historical or foreign military contexts; not a current JSDF rank.
彼は一等軍曹に昇進した。
He was promoted to sergeant first class.
軍曹 is a general term for sergeant, while 一等軍曹 specifies the first-class rank.
Compound of 一等 (first class) and 軍曹 (sergeant), used to translate foreign military ranks.