in
Nagano, Japan, |alt=Two uniformed men in peaked caps Following a three-month course at the Staff College, Camberley, Garrett was appointed commandant of the
Staff College, Queenscliff, Victoria, in June 1946. In December 1949, Garrett resumed command of the Staff College, Queenscliff. He became
Deputy Chief of the General Staff in February 1953. He was promoted temporary
lieutenant general in October 1954 and appointed GOC
Southern Command, which was headquartered in Melbourne and controlled, as of April 1953, several major
Citizen Military Forces (CMF) formations including the
3rd Infantry Division, the
4th and
6th Infantry Brigades, the
2nd Armoured Brigade, and two artillery groups. His elevation to lieutenant general was made permanent in December 1954. He succeeded Lieutenant General
Sir Henry Wells as
Chief of the General Staff (CGS) on 23 March 1958. Garrett was raised to
Knight Commander of the Order of the British Empire in the
1959 New Year Honours. The Army underwent significant change during Garrett's term as CGS.
Alan Stretton, executive officer to the Military Board at the time, recalled Garrett's sense of humour and "most informal" manner. In August, the CGS announced to his senior officers a radical reorganisation of the Army that would strengthen the regular forces and reduce reliance on the CMF, which since
Federation had formed the backbone of Australia's military. This plan included the abolition of
National Service, to which the Federal government had already agreed, and the introduction of a "
pentropic" divisional structure. Garrett championed the pentropic structure to overcome what he saw as the weakness of the traditional battalion for overseas deployments, and to ensure compatibility with the
US Army's
pentomic formations. The Australian Army's traditional "triangular" divisional structure of three infantry battalions under a brigade headquarters was to be replaced with an organisation consisting of five larger battalions (hence "pentropic") without a brigade layer between division and battalion headquarters. The plan was opposed by CMF officers as it would result in the disbandment of the citizens' brigades and many of the old militia battalions. Garrett was concerned not only with changing the Army's organisation but with upgrading its equipment; by the early 1960s the Army would acquire the
FN 7.62mm rifle, the
M60 machine gun, the
M101 105mm howitzer, the
M113 armoured personnel carrier, and new mortars and radios. Garrett was scheduled to retire from the Army on his sixtieth birthday in February 1960 but the government extended his term. Although Garrett's proposed reorganisation of the Army along pentropic lines went ahead under Pollard, it proved short-lived. The US Army abandoned the system in June 1961, and the Australian Army returned to the triangular formation following a review commissioned by Pollard's successor as CGS, Lieutenant General
Sir John Wilton, in October 1964. ==Later life==