A discarded shackle sits on the deck of seagoing buoy tender USCGC Juniper (WLB 201) after a buoy chain replacement in Kaneohe Bay Dec. 10, 2025. Shackles secure buoys to an anchor block, or sinker, which holds the buoy in place, limiting its drift. (U.S. Coast Guard photo by Petty Officer 2nd Class Tyler Robertson)