Long-term political and government appointments have occurred, such as those of King Faisal, who was Foreign Minister almost continuously from 1932 to 1975, King Abdullah, who was Commander of the National Guard from 1963 to 2010, and former Crown prince Sultan bin Abdulaziz, who was Minister of Defence and Aviation from 1962 until his death in 2011. Such terms of service have enabled senior princes to mingle their personal wealth with that of their respective domains. They have often appointed their own sons to senior positions within their own fiefdom. Examples of these include Prince Mutaib bin Abdullah as assistant commander in the National Guard until 2010; Prince Khalid bin Sultan as assistant minister of defence until 2013; Prince Mansour bin Mutaib as assistant minister for Municipal and Rural Affairs until he replaced his father in 2009; and Prince Mohammed bin Nayef as assistant minister in the Interior Ministry. In cases, where portfolios have notably substantial budgets, appointments of younger, often full, brothers have been necessary, as deputies or vice ministers, ostensibly to share the wealth and the burdens of responsibility, of each fiefdom. Examples of these include Prince Abdul Rahman who was vice minister of defence and aviation under Prince Sultan; Prince Badr, deputy to King Abdullah in the National Guard; Prince Sattam, who was Deputy Riyadh Governor during King Salman's term; and Prince Ahmed, who held the deputy minister's portfolio under Prince Nayef's interior ministry.