[citation needed] The 22nd Regiment was originally raised in July 1950 as a unit of the "supplementary reserve", which was formed within the Citizens Military Force to utilise the personnel and resources of various civilian government organisations to raise a military construction capability.

O'Donell and its first annual camp took place at Puckapunyal, with 20 officers and 220 other ranks taking part.

RHQ is based in Dublin Road, Ringwood East, along with 8th Combat Engineer Squadron.

[citation needed] The Regiment has been providing construction and works support to nearly every Army Aboriginal Community Assistance Program (AACAP)[4] task since the Federal Government directed these tasks to begin in 1997.

Since the Regiment was raised it has deployed Army Reserve engineers to Papua New Guinea, South Vietnam, Bougainville, East Timor (Timor L'este), Solomon Islands and Afghanistan.