|Operator||US Air Force|
|Mission duration||14 years (planned)|
|Spacecraft type||WGS Block II|
|Launch mass||5,987 kilograms (13,199 lb)|
|Start of mission|
|Launch date||25 May 2013, 00:27UTC|
|Rocket||Delta IV-M+(5,4) D362|
|Launch site||Cape Canaveral SLC-37B|
|Band||X and Ka band|
|Frequency||7.2/8.4 GHz (Military X-Band) 30/20 GHz (Military Ka-Band)|
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 program, 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 5,987 kilograms (13,199 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.
USA-243 was launched by United Launch Alliance. A Delta IV-M+(5,4) rocket, Delta 362, was used to place it into a supersynchronous transfer orbit, from which the spacecraft will be maneuvered into geostationary orbit. It was launched from Space Launch Complex 37B at the Cape Canaveral Air Force Station at 00:27 UTC on 25 May 2013. A launch attempt 24 hours before was cancelled because of a problem with a helium pressurization line. The launch was successful.