The Air Force yesterday successfully launched its fourth Global Positioning System (GPS) IIF satellite (GPS IIF-4) from Cape Canaveral Air Force Station, Fla. ULA's Atlas V rocket lifted GPS IIF-4 into space. Photo: ULA. The satellite lifted off on one of United Launch Alliance’s (ULA) Atlas V launch vehicles at 5:37 p.m. EST. The satellite, designated as Space Vehicle Number (SVN) 66, is the fourth of 12 GPS IIF satellites that prime contractor Boeing [BA] has on contract with the Air Force. “This…