PALMDALE - Command of Air Force Plant 42 passed to a new leader Wednesday, as Lt. Col. Ronald Ortiz ended his three-year tenure and Lt. Col. Ronald Hirtle took over. The morning ceremony took place outside a hangar, against a backdrop of aircraft that claim Air Force Plant 42 as their birthplace: F-117 stealth fighter, B-2 stealth bomber, U-2 and the experimental X-37 spacecraft demonstrator. "If you look around at these airplanes, they speak for themselves. This is where the cutting edge of the Air Force is born," said Col. James A. Godsey , deputy director of the Engineering Directorate,...