The .mil domain is a sponsored top-level domain (sTLD) that is used exclusively by the U.S. Department of Defense and its subsidiary or affiliated organizations. Its name is derived from the first three letters of ‘military’. Being a domain investor, it’s crucial to understand that .mil domains are not available for public registration and can only be registered by authorized U.S. military entities. As such, they hold no potential for resale or investment for those outside of these organizations.