It was created in 1923 by the National Defence Act, which attempted to unite all air, navy and ground forces under one house. This however was not successfully accomplished until 1968 when the Canadian Forces was created.
Le pouvoir exécutif est dirigé par le chef d’état, qui est techniquement la Reine et sa représentante au Canada, la Gouverneure générale, mais sur le plan pratique, c’est bien sûr le Premier ministre qui a le dernier mot.