The title of this photo in the Library of Congress web site is "U.S.S. Brooklyn, 'Hogan's Alley.'" The figures in the back look as if they are posing as Hogan's Alley characters, or perhaps they are performing for the troops.
"U.S.S. Brooklyn, 'Hogan's Alley.'" Detroit Photographic Co., ca. 1896-1901. Library of Congress American Memory Web Site. 22 Dec. 2003. <http://memory.loc.gov>.