noun
Military term for the senior officer who assists a commander in planning and operations.
See also: 参謀
彼は陸軍の参謀長に任命された。
He was appointed chief of staff of the army.
参謀 is a staff officer or adviser, while 参謀長 is the chief of staff, the head of the staff.
Compound of 参謀 (staff officer) and 長 (chief, head).