On February 23, 1945, during the Battle of Iwo Jima, six men—five U.S. Marines and a U.S. Navy corpsman—raised an American flag atop Mount Suribachi. Joe Rosenthal, a photographer with the Associated Press, happened to put himself in the right place at the right time. With one click of the shutter, he captured a fleeting moment of unity and grit that would echo far beyond the war: the raising of the U.S. flag on Iwo Jima.