The Lockheed Martin F-117 "Stealth" fighter is one of the most sophisticated warplanes ever built. Almost invisible to radar, the F-117 has revolutionized air warfare. It was operated at first under conditions of total secrecy, but in 1991 the U.S. Air Force deployed it openly to Saudi Arabia for service in the Gulf War. Ranging the night skies over Baghdad with impunity, it struck the most heavily defended Iraqi targets with stunning effect.