The collection includes a complete set of letters written by Joseph Warren Hays to his family while serving in the Army Air Corps during World War II. The letters detail his aviation training across the United States and his service in Europe toward the end of the war. In his later years, Mr. Hays wrote recollections of his missions over Europe. The collection also includes printed publications, newspaper clippings, a scrapbook, a photograph of Hays, and ephemera.