Ft. Sillâs 434th Field Artillery Brigade names Drill Sergeant of the Year winner Ft. Sillâs 434th Field Artillery Brigade names Drill Sergeant of the Year winner By Tiffany Bechtel | May 7, 2021 at 6:55 PM CDT - Updated May 7 at 6:58 PM FT. SILL, Okla. (TNN) - Fort Sillâs 434th Field Artillery Brigade named their Drill Sergeant of the Year Friday. Drill Sergeant Matthew Dunbar was named the winner and Drill Sergeant Brett McGillivray was named runner-up. The 434th Field Artilleryâs Brigade commander Colonel Dan Blackmon told 7News a little about the winners and what theyâll be doing next.