SAN FRANCISCO - A Coast Guard patrol boat enforces a security zone on San Francisco Bay for Fleet Week 2010 festivities, Saturday, Oct. 9, 2010, while the US Navy's Blue Angels fly overhead. Fleet Week is a celebration of the sea services where more than 500 sailors, Marines and Coast Guardsmen from visiting ships make the city a port of call. U.S. Coast Guard photo by Lt. Todd Vorenkamp.