 As the British began to withdraw soldiers from British North America in the decades after the War of 1812, the Parliament of the Province of Canada passed the Militia Act of 1855, creating the Active Militia.The Active Militia, later split off into the Permanent Active Militia (PAM), the Militia's regular armed unit (although it continued to use the label militia), and the Non-Permanent Active Militia (NPAM), the Canadian Militia's military reserve force.After PAM's formation, the remaining sedentary militia regiments that made up the Canadian Militia were collectively referred to as the Reserve Militia.