High Quality Content by WIKIPEDIA articles! The Seagoing Buoy Tender is a type of U.S. Coast Guard cutter originally designed to service aids to navigation, throughout the waters of the United States, and wherever U.S. shipping interests require. The Coast Guard has maintained a fleet of seagoing buoy tenders dating back to its origins in the U.S. Light House Service. These ships originally were designated with the hull classification symbol WAGL, but in 1965 the designation was changed to WLB, which is still used today.