Industrial Light & Magic's (ILM) Colin Cantwell sketched and built models that eventually became the final X-wing fighter in "Star Wars". The X-wings were designed to appear more "traditional" than the Empire's TIE fighters. ILM built miniatures in various scales, with wing markings indicating which prop represented which pilot. When ILM fell behind on generating X-wing footage, "Star Wars" producer George Lucas and his editors temporarily used World War II dogfight footage for initial editing cuts. Each X-wing model was built around a hollow core made from surgical tubing, which allowed lighting, cooling, and electrical connectors for the wing motors to be installed and maintained. The cockpit windows were made from faceted glass so that accurate reflections could be filmed. Although the movie's initial script and novelization describe the X-wings as belonging to "Blue squadron", limitations in bluescreen photography led to the markings on the filming models, as well as the fictional squadron affiliation being changed to red.