The Delta IV Heavy rocket can bring up to 50,000 pounds of payload into orbit.
DISA awards task order under commercial satellite acquisition process.
Deactivating the 21st Space Wing radar system will save the Air Force $14 million annually, but the proposed replacement costs could reach $2 billion.
While cutting costs through competition, FCSA is threatened by high demand, lagging supply, security shortfalls.
The sixth satellite in the WGS system will be operational in 2014.
New propulsion system touted as weight, cost saver.
GPS system designed to boost nav capabilities by replacing aging satellites in orbit.
MUOS-2 is part of a next generation narrowband military communication system.