The top-level domain reserved for the U.S. military is .mil.
Created in January 1985, .mil is a sponsored top-level domain for the United States Department of Defense and its eligible agencies, services, and divisions. The name is shortened from “military,” and registration is restricted rather than open to the public.
The domain is closely associated with the U.S. military, but not every military-related website uses it. Recruiting sites, exchanges, and other programs may use .com, while service academies can use .edu. The Department of Defense’s main public website has also used a .gov address, so .mil should not be confused with every official defense website.
The United States is unusual in having a dedicated military top-level domain. Other countries commonly place military organizations under a second-level domain, such as mod.uk for the United Kingdom’s Ministry of Defence. The .mil domain is administered through the Defense Information Systems Agency.