12 Garrison Battalion (VIC) Internal Security

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About This Unit

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12th Garrison Battalion

12th Garrison Battalion was raised in Victoria for Internal Security operations.

Garrison Battalions were part of the Australian 'Army Reserve' within the CMF Militia structure for Homeland Defence with the role of manning fixed defences and vulnerable points. The personnel were Class B men, those between 48 and 55 who had seen war service before September 1939, therefore mostly WW1 veterans.

The first seven Garrison battalions were raised in October 1939, rising to 33 battalions plus around four individual companies by the end of the war. 

A total of 33 were raised across the States numbered 1-33 and where more than three battalions were raised, they were grouped in State-based Brigades, numbered in accordance with the relevant Military District Headquarters in which they were embedded; 1 Garrison Brigade in Queensland, 2 in New South Wales, 3 in Victoria, 4 in South Australia and 5 in Western Australia.

Prisoner-of-War and Internment Camp units were part of the Garrison Battalion organisation but were on a special establishment where the need for prior war service was waived. AWAS (female) personnel were subsequently often posted in for clerical and administrative roles.

From early on some battalions had adopted a secondary title indicating their specific role, such as (Internal Security). In 1942 this was formalised and most battalions were given an appropriate secondary title.

Initially, all Garrison Battalions wore the same shoulder patch, a black square on a green square. Numerous requests were made by battalions to individualise their patches and in late 1942 the system was adopted of geometric shapes, green on black in a reversal of the original design, approval for which was dated 11 December 1942.

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