<P> The Selective Service System provides the names of all registrants to the Joint Advertising Marketing Research & Studies (JAMRS) program for inclusion in the JAMRS Consolidated Recruitment Database . The names are distributed to the Services for recruiting purposes on a quarterly basis . </P> <P> Regulations are codified at Title 32 of the Code of Federal Regulations, Chapter XVI . </P> <P> Owing to very slow enlistment following the U.S. declaration of war against Germany on April 6, the Selective Service Act of 1917 (40 Stat. 76) was passed by the 65th United States Congress on May 18, 1917, creating the Selective Service System to raise an army to fight in Europe . The Act gave the President the power to conscript men for military service . All men aged 21 to 30 were required to register for military service for a service period of 12 months . As of mid-November 1917, all registrants were placed in one of five new classifications . Men in Class I were the first to be drafted, and men in lower classifications were deferred . Dependency deferments for registrants who were fathers or husbands were especially widespread . The age limit was later raised in August 1918 to a maximum age of 45 . The military draft was discontinued in 1920 . </P> <Table> <Tr> <Th> War </Th> <Th> Years Active </Th> <Th> Number of Wartime Draftees </Th> </Tr> <Tr> <Td> World War I </Td> <Td> Sept 1917--Nov 1918 </Td> <Td> 2,810,296 </Td> </Tr> <Tr> <Td> World War II </Td> <Td> Nov 1940--Oct 1946 </Td> <Td> 10,110,104 </Td> </Tr> <Tr> <Td> Korean War </Td> <Td> June 1950--June 1953 </Td> <Td> 1,529,539 </Td> </Tr> <Tr> <Td> Vietnam War </Td> <Td> Aug 1964--Feb 1973 </Td> <Td> 1,857,304 </Td> </Tr> </Table>

When do you age out of selective service