Vintage (blue on green) Patch Set of 2 Military GI Issue US Air Force USAF Sergeant Sgt (E-4) or Senior Sergeant SrA (E-4) Men's Chevron Patch Set, 1986-1992. Old store stock. This color of chevrons were first issued with the OD Green uniforms for Sgt E-4 ranks, and then the Woodland BDU uniforms for SrA E-4 ranks after the rank restructure within the Air Force prior to the change to ABUs. They measure about 3" wide.