The USO did wonders for the morale of soldiers such as this M-4 tank crew from Fort Knox, Kentucky

CREDIT: Palmer, Alfred T., photographer. "M-4 tank Crews of the United States, Ft. Knox, Kentucky." June 1942. America from the Great Depression to World War II: Color Photographs from the FSA-OWI, 1935-1945, American Memory collections, Library of Congress.