The F-22A Raptor, the newest addition to the Air Force arsenal, entered operational status Thursday after nearly 20 years of development and testing, much of it in the skies above the Antelope Valley. "This is a great day for us in the Air Force," said Gen. Ronald E. Keys, commander of Air Combat Command. "I'm very happy to add this arrow to our quiver." The F-22A incorporates advancements in stealth, fuel-saving supersonic flight without afterburners, advanced avionics to provide pilots with better information about their environment and superior maneuverability. Keys considered the aircraft's capability and supportability in assigning the Raptor...