Military Service Acts were introduced to enact conscription: Military Service Act 1916, introduced in January 1916 in the UK during World War I Military Service Act (Canada), introduced in Canada in 1917 during World War I Military Service Act 1939, introduced in the United Kingdom in 1939 in the run-up to World War II Military Service Act (South Korea), enacting conscription in South Korea Military Service Act (Taiwan), enacting conscription in Taiwan See also Military Selective Service Act, in the United States National Service Act (disambiguation) Selective Service Act (disambiguation)