"The inaugural launch of the GPS IIF-1 is a milestone in
Boeing's 30 years of support to the Air Force that goes back to the
first days of this program. The new GPS IIF satellites bring key
improvements, including a more jam-resistant military signal, a new
civil signal to enhance commercial aviation and search-and-rescue
operations, and significantly improved signal accuracy as more of
these new satellites go into operation."
Source: Craig Cooning, Vice President and
general manager, Boeing Space and Intelligence Systems, speaking
after the successful launch of the latest generation of GPS
Sats.