WASHINGTON (CNN) - WorldCom holds billions of dollars of federal contracts, including several with the Pentagon that are vital to maintaining global military communications.

Pentagon officials told CNN Thursday they do not believe the company's current financial problems will jeopardize national security, but they also said they will continue to monitor the situation.

Under a nine-year, $400 million contract with the Pentagon's Defense Information System Agency (DISA), WorldCom (WCOM: Research, Estimates) provides services for the military system that handles all communications traffic ranging from "unclassified" through the "secret" level.

The company also holds a 10-year, $4 billion contract to provide fiber and satellite communications services through the DISA for all federal users stationed in the Middle East, Caribbean, South America and Asia-Pacific.

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And WorldCom recently was part of a team that won an eight-year, $7 billion Navy and Marine Corps intranet contract, providing secure access to voice, video and data communications.

As part of its work with the federal government, WorldCom was called in on Sept. 11 to ensure that military command and control networks between the Pentagon and forces around the world continued to function.

WorldCom also holds key contracts with the FAA, the Postal Service and the Congressional House of Representatives for telecommunications services.