The reintroduction of this conscription scheme saw the numbers of the CMF rise substantially but its management and administration required the allocation of a large number of resources and personnel from the Regular Army at a time when the army Regular Army already heavily committed in Korea and Malaya and so the scheme was suspended in 1959. This was a significant blow to the CMF and its strength fell by more than half in that year to 20,000 men. Further changes came with the introduction of the pentropic (five battle group) division into the Australian Army in 1960. This proved a disaster for the CMF, as wholesale changes were made and units removed from the order of battle. Seven artillery regiments were disbanded from an original total of 17, while 31 infantry battalions were reduced to 17. This excluded the University Regiments and the Papua New Guinea Volunteer Rifles which remained unchanged. The remaining battalions were later merged into just nine battalions. Meanwhile, the CMF armoured units had already been rationalised in 1957 and as a result the change to the pentropic structure mostly resulted in a change in role only, such as the &lt;a href="4th/19th%20Prince%20of%20Wales%27s%20Light%20Horse"&gt;4th/19th Prince of Wales's Light Horse&lt;/a&gt;, which changed from an armoured unit to a reconnaissance regiment. The two CMF armoured brigade headquarters were also disbanded.