Crewmembers of the Coast Guard Cutter George Cobb,

Crewmembers of the Coast Guard Cutter George Cobb, a 175-foot coastal buoy tender homeported in San Pedro, Calif., place a yellow buoy marking the center of the San Francisco Fleet Week 2017 security zone, Oct. 2, 2017.
Four other buoys will mark the corners of a rectangular security zone regulated for the safety and security of participants and spectators during the parade of ships and air show. U.S. Coast Guard photo by Petty Officer 2nd Class Cory J. Mendenhall.