Govt Issue US Air Force Master Sergeant Shoulder Insignia. Size Large. NSN# 8455-01-135-0023. Pair of US Air Force master sergeant insignia. Silver thread on dark blue shoulder straps, shoulder boards, 2.25 in. by 4.25 in., flat tube construction to fit uniform shoulder straps. New condition. Desert Storm era. * Note if you order just this item we will mail it in an envelope so your freight will be considerable less ($1.00 or less) than the site posts.