Lockheed Martin [NYSE: LMT] has successfully delivered the core structure with an integrated propulsion subsystem for the first satellite in the U.S. Navy's Mobile User Objective System (MUOS) constellation. It is the largest A2100 spacecraft core structure ever built by the company. MUOS will provide significantly improved and assured communications for U.S. mobile warfighters. The Lockheed Martin design features 3G mobile technology that will deliver simultaneous voice and data services, as well as the ability to increase capacity and features over the life of the program. Users of the current Ultra High Frequency Follow-On system will have improved service and complete interoperability with the MUOS legacy payload which ensures a smooth transition to the next generation of 3G mobile user equipment. Developed and tested at Lockheed Martin's Mississippi Space & Technology Center, an advanced propulsion, thermal, and metrology facility located at the John C. Stennis Space Center, the propulsion subsystem is essential for maneuvering the MUOS satellite during transfer orbit to its final location as well as conducting on-orbit repositioning maneuvers throughout its mission life. The system was delivered to Lockheed Martin's facilities in Sunnyvale, California, in preparation for spacecraft assembly, integration and test scheduled to begin later this year. The first MUOS satellite along with the associated ground system are scheduled for on-orbit hand-over to the U.S. Navy in 2010.