Anniversary of National Service 1951-1972Anniversary of National Service 1951 1972 Full size medal Unmounted with 15cm ribbon as required for swing mounting. Miniature size medal Unmounted with 10cm ribbon as required for swing mounting. The Anniversary of National Service 1951 1972 Medal was introduced in 2001 to recognise those who completed their obligation under the two National Service schemes that had operated in Australia between 1951 and 1972. Eligibility for the medal is dependent