be a member of either house of the Diet. (This implies a minimum age of 25 and a Japanese nationality requirement.) Must be a civilian. This excludes serving members of the Japan Self-Defense Forces. Former military persons may be appointed, with Yasuhiro Nakasone being one prominent example. Role Constitutional roles Exercises "control and supervision" over the entire executive branch. Presents bills to the Diet on behalf of the Cabinet. Signs laws and Cabinet orders (along with other members of the Cabinet). Appoints all Cabinet ministers, and can dismiss them at any time. May permit legal action to be taken against Cabinet ministers. Must make reports on domestic and foreign relations to the Diet. Must report to the Diet upon demand to provide answers or explanations. May advise the Emperor to dissolve the Diet's House of Representatives. Statutory roles Presides over meetings of the Cabinet. Commander-in-chief of the Japan Self-Defense Forces. May override a court injunction against an administrative act upon showing of cause. Unlike most of his counterparts in constitutional monarchies, the prime minister is both de jure and de facto chief executive. In most other constitutional monarchies, the monarch is nominal chief executive, while being bound by convention to act on the advice of the cabinet. In contrast, the Constitution of Japan explicitly vests executive power in the Cabinet, of which the prime minister is the leader. His countersignature is required for all laws and Cabinet orders. While most ministers in parliamentary democracies have some freedom of action within the bounds of cabinet collective responsibility, the Japanese Cabinet is effectively an extension of the prime minister's authority. Insignia Official office and residence Located near the Diet building, the Office of the Prime Minister of Japan is called the . The original Kantei served from 1929 until 2002, when a new building was inaugurated to serve as the current Kantei. The old Kantei was then converted into the Official Residence, or . The Kōtei lies to the southwest of the Kantei, and is linked by a walkway. Travel The Prime Minister of Japan travels in a Toyota Century, which replaced the Lexus LS 600h L in 2019. For overseas air travel, the Japanese government maintains two Boeing 777, which replaced the Boeing 747-400 also in 2019. The aircraft is also used by the emperor, the members of the Imperial family, and other high-ranking officials. They have the radio callsigns Japanese