SD:CMP Tri-Polsten

 is a Canadian Anti-air unit.

Overview
The CMP (Canadian Military Pattern) truck was designed by General Motors and Ford and Chrysler in response to an invitation from the Canadian Department of National Defense from 1937. Designed to follow British CMP specifications, in order to maintain commonality with Commonwealth vehicles in the event of the war, the CMP truck became one of the crucial elements of British military forces after the BEF was forced to abandon most of its fleet at Dunkirk in 1940. Numerous variants were manufactured, with over 500,000 CMP trucks produced in total over the course of the war, used by all Commonwealth nations. This particular variant is the Ford F15, with the cargo bed removed and replaced by a Tri-Polsten AA gun.