Topgun instructors reviewing gun camera film at officers quarters, NAS Key West, FL. In the 1980s, instructors went to Key West for a week or more every few years to take advantage of the flying conditions and concentrate on instructor under training (IUT) flights. Topgun instructor pilots also shot the F-5's guns at a banner towed by another aircraft. To ensure the training value of these flights, we carefully reviewed the film from the gun cameras every day. Actually shooting the guns and scoring the flights maintained instructor skills -- and credibility.