The US Air Force Space and Missile Systems Center has awarded a contract modification to perform the launch services for the wideband global SATCOM-4 (WGS-4) satellite.

Scheduled to launch between December 2011 and February 2012, the WGS-4 will be launched by United Launch Alliance, aboard a Delta IV evolved expendable launch vehicle.

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The Delta IV Medium+ (5,4) configuration will use a single common booster core with a Pratt & Whitney Rocketdyne RS-68 main engine with four Alliant Techsystems GEM 60 solid rocket motors, for the launch.

The Delta IV will also be have a PWR RL10B-2 upper stage engine and a 5m diameter upper stage and composite payload fairing.

Part of a new high-capacity satellite communications system, the WGS-4 will provide enhanced communications capabilities to US troops during critical operations in future.

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The WGS will also perform command and control, communications, computers, intelligence, surveillance and reconnaissance (C4ISR), and battle management and combat support information functions in a robust and flexible manner.

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The fourth satellite of the WGS system and the first in the block II series, the WGS-4 will be launched from Space Launch Complex-37 at Cape Canaveral Air Force Station, Florida.

Following the launch, the WGS-4 will join the existing WGS-1, 2 and 3 satellites and provide additional information broadcast capabilities.