The commander of the Air Force's space acquisition office on Friday declared the ground system for the next-generation of Global Positioning System satellites the Defense Department's most troubled program. Lt. Gen. Samuel Greaves, commander of the service's Space and Missile Systems Center, said during a Feb. 19 Mitchell Institute event that GPS OCX is not only a “very, very, very important” program for DOD and the nation -- it is also the program most in danger of failing. “The GPS...