USA-243, also known as WGS-5, is an American military communications satellite. It was the fifth satellite to be launched as part of the Wideband Global SATCOM programme, and the second Block II spacecraft. Constructed by Boeing, USA-243 is based on the BSS-702HP satellite bus. It had a mass at liftoff of kilogram (lb), and a design life of 14 years. Its two solar panels generate upwards of 11 kilowatts of power. The spacecraft is equipped with X and Ka-band transponders. An R-4D bipropellant rocket motor and four XIPS-25 ion engines provide propulsion.