Chief Warrant Officer Joshua Marzi heats up the pin of a shackle as Ensign Joseph Snyder stabilizes the shackle with chain hooks during a competition aboard the Coast Guard Cutter Kukui moored to the pier at Coast Guard Station Juneau, Alaska, Aug. 21, 2019.
Heat and beat refers to when a shackle pin is heated up and one or two people use sledge hammers to beat the torched metal down, which locks the shackle.
U.S. Coast Guard photo by Petty Officer 3rd Class Amanda Norcross.