Dorchester was a War Shipping Administration troop ship operated by its agent Agwilines allocated to United States Army requirements that was sunk in the Labrador Sea by a torpedo from a German U-boat on February 3, 1943, during World War II. It was sailing to Greenland as part of a naval convoy. The loss of the ship became especially famous because of the story of the death of four Army chaplains, known as the "Four Chaplains" or the "Immortal Chaplains," who all gave away their life jackets to save others before they died.