- First Sergeant (1Sgt) - 3 Chevrons, Diamond in the Center, 3 Rockers - SNCO E-9 (MGySgt) - Master Gunnery Sergeant (MGySgt) - 3 Chevrons, Bursting Bomb in the Center, 4 Rockers - SNCO E-9 (SgtMaj) - Sergeant Major (SgtMaj) ...