The chief of the Defence Staff (CDS; ; ) is the professional head of the Canadian Armed Forces. As the senior military position, the chief of the Defence Staff advises the Cabinet, particularly the minister of national defence and the prime minister. The role is a Crown-in-Council appointment made by the viceroy on the advice of the prime minister. Lieutenant-General Wayne D. Eyre was designated as the acting chief of the Defence Staff on 24 February 2021, following Admiral Art McDonald taking a voluntary paid leave pending an investigation by the Canadian Forces National Investigation Service. On 13 August 2021, Eyre was promoted to general and was appointed to the position on a permanent basis on 25 November 2021. History Until 1964, there existed a chief of the Naval Staff, as head of the Royal Canadian Navy; a chief of the General Staff, as head of the Canadian Army; and a chief of the Air Staff, as head of the Royal Canadian Air Force. A position known as the Chairman of the Chiefs of Staff Committee existed from 1951 to 1964, which had a loose coordination function, although it lacked the command and control responsibilities of the later position of chief of the Defence Staff (CDS). Only two officers served in the role in its 13-year history:General Charles Foulkes (1951–1960) and Air Chief Marshal Frank Robert Miller (1960–1964). The position of chairman of the Chiefs of Staff Committee and the positions of the three service chiefs were abolished in 1964 and replaced by the position of CDS. This change was based on a white paper initiated by National Defence Minister Paul Hellyer in the Cabinet of Prime Minister Lester B. Pearson. Following the tabling of the white paper, the minister introduced legislation that took effect in August 1964. The newly established chief of the Defence Staff was to "head all of Canada's military forces, backed by a defence headquarters that was integrated and restructured to reflect six so-called functional commands, replacing eleven former service commands. Functional described a command that was non-geographic and beyond any particular service or traditional arm." In May 1967, Bill C-243 was passed by parliament and was effective as of 1 February 1968. The law dissolved the three armed services and created the Canadian Armed Forces under the command of the CDS. In 2011, the three functional commands—named Maritime Command, Land Force Command, and Air Command—had