4 Engineer Support Regiment

4 Engineer Support Regiment is a regiment of the Canadian Military Engineers located at CFB Gagetown, New Brunswick. It is tasked to provide general engineer support to the whole of the Canadian Forces.

4 ESR was officially formed when 4 Combat Engineer Regiment returned from CFB Lahr in Germany when 4 Canadian Mechanized Brigade Group was stood down. 4 CER absorbed 22 Field Engineer Squadron from 2 Combat Engineer Regiment which was already located at CFB Gagetown surpporting the 2nd Battalion The Royal Canadian Regiment.

The unit consists of 42 Field Squadron, 43 Counter Improvised Explosive Device Squadron, 45 Support Squadron, and 48 Combat Service Support Squadron.