Red Flag is the U.S. Air Force's largest air combat training exercise, staged over the Nevada desert with allied squadrons flying alongside American pilots in scenarios built to mimic real war before anyone sees actual combat. The film follows pilot John Stratton through the exercise, tracking briefings, cockpit footage, and debriefs as he and his aircrew work through simulated dogfights and strike missions against an opposing "enemy" force flown by fellow airmen. Nellis Air Force Base serves as the staging ground, and the desert terrain around it doubles as the battlefield for missions designed to expose pilots to the confusion and stress of combat while the stakes are still survivable. The film treats Red Flag as the last filter before deployment, the point where flying skill either holds up under simulated fire or doesn't. Interviews with pilots and instructors fill in what the exercise is actually testing, from split-second decisions in a dogfight to coordinating with allied aircrews who train, brief, and fly in a language that isn't always their own.