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.
With the advent of digital information systems and the Internet, the scope of publishing has expanded to include electronic resources such as the electronic versions of books and periodicals, as well as micropublishing, websites, blogs, video game publishers, and the like.
Agents are as diversified as publishers. Know what kind of book you're writing (i.e., fiction--children's, genre or literary), or non-fiction (i.e., a biography, a math book, a cookbook, a self-help book, etc.) and then do your research to find out which agents rep that type of title.