The simulation allowed the pilot to practice in a real F-22 against a virtual reality J-20. An American veteran F-22 pilot just took on a virtual representation of China’s Chengdu J-20 stealth fighter from the seat of a very real aircraft in flight. The Chinese fighter was projected on the pilot’s augmented reality helmet-mounted display, giving a real pilot in a real aircraft the opportunity to train against a seemingly real foreign opponent. According to the two firms responsible for the test, this marks the first time such an engagement with a virtual adversary has ever been achieved.