22nd Engineer Regiment
The 22nd Engineer Regiment provides engineer support to 4th Brigade.
The Regiment has led the ADF response to Victoria's bushfires, provided construction and works support to nearly every Army Aboriginal Community Assistance Program, and deployed Army Reserve Engineers to Papua New Guinea, South Vietnam, Bougainville, East Timor (Timor L'este), Solomon Islands and Afghanistan.
The regimental headquarters RHQ is based in Ringwood East, along with 8th Combat Engineer Squadron. 105th Construction Squadron is based at Oakleigh, while the 10th Combat Engineer Squadron is based at Newborough in Gippsland, Victoria.