noun
assistant chief of staff (G3)
Military term for the assistant chief of staff in charge of operations and training (G3). Used in contexts such as the Japan Ground Self-Defense Force.
第三部長は作戦計画を担当する。
The assistant chief of staff (G3) is in charge of operational planning.
Compound of 第三 (third) + 部長 (department head), referring to the third section (operations) of a military staff.