The resultant Order was initially known as the Military and Naval Order of the United States and was organized and later incorporated under that name. Its hereditary line of descent spans the period of American history since national independence during the Revolutionary War. Initially membership in the Order was limited to officer veterans (and their hereditary descendants) of the Revolutionary War, the War of 1812, and the Mexican War. (In addition, there is a requirement that ancestors who were militia officers must have had active service during wartime.)