4 Engineer Support Regiment

4 Engineer Support Regiment (4e Régiment d'appui du génie) is a regiment of the Canadian Military Engineers headquartered at CFB Gagetown, New Brunswick. It is tasked to provide general engineer support to the whole of the Canadian Armed Forces.

4 ESR was officially formed in 1993 when 4 Combat Engineer Regiment (4 CER) returned from CFB Lahr in Germany when 4 Canadian Mechanized Brigade Group was stood down. 4 CER absorbed 22 Field Squadron, a detached and independent unit affiliated with 2 Combat Engineer Regiment. 22 Field Squadron was stationed in CFB Gagetown supporting the 2nd Battalion The Royal Canadian Regiment Battle Group, the Combat Training Centre and 4 CER in Germany.

On 1 June 2022, the perpetuation of No. 2 Construction Battalion of the First World War Canadian Expeditionary Force was assigned to the Canadian Military Engineers, with 4 Engineer Support Regiment being responsible for ongoing public recognition of the perpetuation.

4 Engineer Support Regiment

 * Originated on 17 June 1977, in Lahr, Germany, as 4 Combat Engineer Regiment.
 * Redesignated on 4 September 1992, as 4th Engineer Support Regiment.
 * Redesignated on 30 September 1993, as 4 Engineer Support Regiment.

4 Field Engineer Squadron

 * Originated on 1 August 1951, in Petawawa, Ontario, as 59th Independent Field Squadron, RCE.
 * Redesignated on 16 October 1953, as 4th Field Squadron, RCE.
 * Redesignated on 30 April 1958, as 4 Field Squadron.
 * Redesignated on 21 May 1975, as 4 Field Engineer Squadron.
 * Reorganized as a regiment on 17 June 1977, and Designated as 4 Combat Engineer Regiment.

Sub-units
The unit currently consists of:


 * Regimental Headquarters
 * 42 Field Squadron
 * 43 Counter Explosive Threat Squadron
 * 45 Support Squadron
 * 48 Combat Service Support Squadron.