The Air Force has pushed the launch of its fifth Wideband Global Satcom satellite (WGS-5) to Thursday, according to United Launch Alliance (ULA), which is providing the launch vehicle. Wideband Global Satcom (WGS) satellites. Photo: Air Force. ULA spokeswoman Jessica Rye said Sunday during acceptance testing for another mission an avionics box that is used for controlling Delta booster RS-68 experienced an anomaly. Rye said ULA is replacing the engine control unit on the WGS-5 launch vehicle, a Delta IV, with one that…