 In some cases, an ambassador-at-large may even be specifically assigned a role to advise and assist the state or Government in particular issues.Historically, presidents or prime ministers have commissioned special diplomatic envoys for specific assignments, primarily overseas but sometimes also within the country as ambassadors-at-large.While the title generally reflects the ambassador's second head position as head of a diplomatic mission, in some countries the term may also represent a rank held by career diplomats, as a matter of internal promotion, regardless of the posting, and in many national careers it is quite common for them to be appointed to other functions, especially within the ministry/ministries in charge of foreign affairs, in some countries in systematic alternation with actual postings.