Just joined this site and seeing some of these magnificent posts. The caps....these caps were made of either leather, or Naugahyde (vinyl) and we’re different for each squadron. Normally red, blue, yellow for SAC bomb squadrons, green for refueling, black for wing weenies, and white for StanBoard....but this is just a guideline. There were also caps with multiple colors as well. These were all primarily worn from 58-65 timeframe. Will post some pics.