Input (grade 11): A Sergeant (Sgt) in the British Army wears three point-down chevrons on their sleeve and usually serves as a platoon or troop sergeant, or in a specialist position.
Output (grade 6): A sergeant (Sgt) in the British Army wears three point-down chevrons, or "checks" on their sleeve. They usually serves as a platoon, troop, or group sergeant, or in a specialist position.