Star Trek: The Original Series Operations Knit Hat Show your love and keep your head warm with this Star Trek: The Original Series Operations Knit Hat. Inspired from the uniforms of the Enterprise crew members, this knit hat features the Operations division color and a gold fabric division insignia embroidered on the front. Bundle up while you're exploring new life and new civilizations with this Star Trek: The Original Series Operations Knit Hat! Measures about 8 3/4-inches long.