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.
Once a publisher decides a book is going to be published, everything has to be coordinated so that books get out into the market when the company said they would. At a publisher, a managing editor keeps track of what everyone is doing. If you are self-publishing, you'll have to fill that role.