The principal role of 3rd Regiment is to contribute to the maintenance of Malta's territorial integrity by deploying well-trained and motivated soldiers to provide adequate logistic back-up and support to 1st and 2nd Regiments.This logistical support includes electrical and mechanical engineering maintenance and servicing, ammunition storage expertise and explosives ordinance disposal.

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An integral part of the Regiment is the field engineering unit which apart from its normal peace time support back-up, also performs engineer battlefield functions for the Infantry Units, focusing on mobility, counter mobility and survivability.