SAN FRANCISCO -- A Coast Guard MH-65 Dolphin helicopter, from Air Station San Francisco, hovers while the crew prepares to perform a search and rescue demonstration near Crissy Field, Saturday, Oct. 9, 2010, during Fleet Week 2010. Fleet week is a celebration of the sea services wherein more than 500 sailors, Marines and Coast Guardsman from two visiting Navy and Coast Guard ships make the city a port of call. U.S. Coast Guard photo by Petty Officer 3rd Class Erik Swanson.