Photo 1: Submarine chaser SC 57. T. Woofenden Collection,
Photo 2: Caption: U.S. Submarine Chaser, which is equipped with Electrose insulation. S.C. 57 06-13-19. Photograph of submarine chaser SC 57. National Archives, Record Group 165-WW, Fiche 1393. Thanks to Dan Treadwell for submitting the digital image to the Subchaser Archives.
Photo 3: A photo of SC 57 in the book, The United States in the World War (Russell & Moore, 1921).