In Death Valley National Park, north of Barstow, California, is Rainbow Canyon. It’s not especially remarkable, just one canyon in an area full of them, all but indistinguishable from its neighbors in an area populated mainly by snakes. But stand on one of the canyon tops for long enough and a fighter jet will suddenly roar into the valley below you, flying fast and very, very low. It will be visible for only a few seconds before it turns hard and disappears behind the next hill. But during those few moments, anyone with a camera has a brief chance to take a spectacular picture. Rainbow Canyon (or Star Wars Canyon, as some call it) is part of the R-2508 restricted airspace complex, host to a busy, low-level training route for combat aircraft.

Military pilots train to fly low and fast, hiding behind hills to fool radar and going fast enough that they can’t be shot at. Since flying is a perishable skill, every fighter or attack pilot periodically has to practice such low-level flights. Rainbow Canyon is in the desert of eastern California, where the population is sparse and the airspace wide open. It’s also surrounded by military bases, bombing ranges, maneuvering grounds and radars—an ideal spot for military pilots to hone their skills. Among the nearby facilities are Edwards AFB, Naval Air Station China Lake, and Plant 42 (where Lockheed and Northrop build advanced aircraft).