noun
first lieutenant; lieutenant junior grade
Military rank; in the army/air force it corresponds to first lieutenant, and in the navy to lieutenant junior grade. The exact equivalent depends on the service branch.
彼は陸軍の中尉に昇進した。
He was promoted to first lieutenant in the army.
海軍の中尉として護衛艦に乗
He serves aboard a destroyer as a lieutenant junior grade in the navy.