people served in the Survey Section (RAE), Australian Survey Corps units and Royal Australian Survey Corps units from 1910 to 1996, including more than 580 women from 1942 to 1996. A Survey Corps Nominal Roll 1915–1996 may be accessed from the front page of the website of the Royal Australian Survey Corps Association linked on External Links below. The Corps participated in the national service scheme in the 1950s, training and maintaining two Citizen Military Force topographic survey companies in Sydney and Melbourne from 1951 to 1957, mainly for national servicemen to complete their obligations. National servicemen then served with the Survey Corps in Vietnam from 1966 to 1971. The Army Audio Visual Unit was the only Corps unit not to have a mapping related role. Equipment, Technology and Techniques Significant examples: 1910–1915: established the standard for the Australian Military Map Series, based on United Kingdom Ordnance Survey maps; mainly 'one-mile-to-one-inch' maps (known as the 'one-mile' map) produced from field survey sheets 'one-mile-to-two-inches' using plane-tabling and parish plans for position, scale and orientation, final map compilation by ink fair drawing at 'one-mile-to-two-inches' using a polyconic projection and lithographic draughting for colour separation (seven colours) and photographic reduction to 'one-mile-to-one-inch' for printing by the Victorian Government Printer. The Military Survey sheet numbering system was that of the International Map Congress of 1912. Standard map sheet extent was 30 min longitude x 15 min latitude. Standard height contour interval was 50 feet. 1914: commenced geodetic triangulation (angles by theodolite, azimuth by astronomy and scale by baselines measured with metal tapes) replacing parish plans as the basis for topographic mapping 1923–1927: used No 1 Squadron, Royal Australian Air Force air photography to complement topographic survey by plane-tabling 1930–1933: the first map produced from a significant use of air photography for topographic compilation using graphical methods of perspective rectification – Albury, New South Wales, '1 mile' map. Work on this map highlighted the disparity between the Victoria and New South Wales state survey triangulation networks. The grid on this sheet was most likely the first instance of cartographic scribing in Australia, done by Warrant Officer Harry Raisbeck engraving the emulsion of a glass plate negative using one tip of a broken ruling pen for the thicker 10,000-yard grid lines and a steel needle to scribe the 1,000-yard grid. This was 23 years before the first map was fully scribed. 1933: adopted Sydney Observatory as