The U.S. Army was founded on June 14, 1775, when the Continental Congress authorized enlistment of riflemen to serve the United Colonies for one year. For more on the history of the U.S. Army birthday, click here: the Army birthday.
Directory publishing is a specialized genre within the publishing industry. These publishers produce mailing lists, telephone books, and other types of directories. With the advent of the Internet, many of these directories are now online.
There are also self-help books and many types that might be considered reference material, like encyclopedias. Books of personal essays, which may or may not be autobiographical, may fit into the non-fiction genre too. Fiction book genres are numerous and some books fall into subgenres. Main fiction categories include romances, westerns, mysteries, science fiction, fantasy, thrillers, horror, and historical fiction. It can be easy to see why books might fall into different categories at the same time.