Home / Vietnam War Era / Patches & Insignia / Vietnam War Era Chemical Corps Enlisted Collar Disk Vietnam War Era Chemical Corps Enlisted Collar Disk$7.00 Reverse marked “S-21” for Harry Sugarman, Inc. Solid back with clutch fasteners. Vietnam War Era Chemical Corps Enlisted Collar Disk quantity Add to cart Item Number: d506 Categories: Metal Insignia, Patches & Insignia, Vietnam War Era