noun
branch of an army; arm of the service
Military term referring to a category of troops based on their primary function or equipment, such as infantry, cavalry, or artillery.
歩兵は最も古い兵種の一つだ。
Infantry is one of the oldest branches of an army.
彼は新しい兵種の創設を提案した。
He proposed the establishment of a new arm of the service.