U.S. Coast Guard Chief Petty Officer Alfonso Estades, a Boatswain’s Mate aboard the Coast Guard Mackinaw, hammers a shackle underway on Lake Michigan, Nov. 30, 2021. Estades used two types of hammers to remove the shackle from the chain so it can be reconnected to another buoy. (U.S. Coast Guard photo by Petty Officer 3rd Class Jessica Fontenette)