noun
Abbreviation of 一等陸曹 (いっとうりくそう), a rank in the Japan Ground Self-Defense Force. Used in military contexts.
See also: 一等陸曹
彼は一曹に昇進した。
He was promoted to master sergeant.
一曹として部隊を指導する責任がある。
As a master sergeant, he has the responsibility to lead the unit.
Full, unabbreviated form of the same rank. 一曹 is the common abbreviation.
Abbreviation of 一等陸曹 (いっとうりくそう), literally 'first class land sergeant'.