What just happened? In what has been hailed as a milestone moment for artificial intelligence's use in the military, the US Air Force has announced that it successfully tested a modified, AI-controlled fighter jet in a dogfight against human pilots last year. The US Air Force Test Pilot School and the Defense Advanced Research Projects Agency (DARPA) first started testing a Lockheed Martin X-62A VISTA (Variable In-flight Simulation Test Aircraft) fitted with AI software back in December 2022, part of the Air Combat Evolution (ACE) program.