"AUTONOMOUS ATTACKER - One of two Boeing J-UCAS X-45A unmanned aircraft lands after completing its first simulated combat mission and 50th flight last February at NASA's Dryden Flight Research Center at Edwards Air Force Base.""AUTONOMOUS ATTACKER - One of two Boeing J-UCAS X-45A unmanned aircraft lands after completing its first simulated combat mission and 50th flight last February at NASA's Dryden Flight Research Center at Edwards Air Force Base."J-UCAS