USA 184, also known as RAVEN 4, is a satellite operated by NROC (National Reconnaissance Office) for SIGINT (Signals Intelligence) and early warning purposes. It was launched on June 28, 2006, from Vandenberg Air Force Base's SLC-6 launch pad using the Delta 4M+(4,2) rocket. The satellite has a cylindrical shape with two panels, measuring approximately 7 meters in length and 4 meters in diameter, with a span of 10 meters. Its dry mass is about 3000 kilograms, while its launch mass was around 4000 kilograms. The manufacturer is listed as UNKUS (an unknown US entity). Additional details such as equipment, motor type, power source, and material composition are not specified in the provided data.