U.S. Navy and the #50? UPDATE:

hearing Jon Wood will have the US Navy as the primary sponsor on the #50 Roush Racing Ford truck(2-6-2002)
UPDATE: The #50 Ford that Jon Wood drives in the CTS will bear a U.S. Navy logo this year. Since government entities cant sponsor a race car, the Navy is simply using the truck as a mobile billboard by buying space on the truck. (NASCAR.com)(2-8-2002)