were discontinued in 1959, and although Defence preferred 1:50,000 maps for tactical operations, it recognised the resources needed for such a programme over large regional areas of Australia and accepted the 1:100,000 map as a practical substitute with 1:50,000 maps over specific areas of interest and military training areas. Then in 1983 Defence endorsed a program for more than 2600 scale 1:50,000 maps in Defence priority areas in north and north-west Australia, its territories and the main land communication routes. By 1996 the Corps had completed more than 1900 of these maps by – field surveys using mainly US TRANSIT and GPS satellite positioning systems and aircraft mounted laser terrain profiling, new coverage aerial photography, aerotriangulation, compilation and cartographic completion on computer assisted mapping systems and produced both digital and printed topographic products. Production of the military specification Joint Operation Graphics scale 1:250,000 is mentioned in the section "National Survey and Mapping Programmes" below. In addition, there was a miscellany of surveys, maps and information produced by the Corps for units of each of the Armed Services. These included: production of air navigation charts for the Royal Australian Air Force covering Australia and a large area of its region totalling about eight per cent of the earth's surface; printing hydrographic charts for the Hydrographer Royal Australian Navy; joint and single service training area special surveys, maps and models including live fire requirements; vital asset protection maps; safeguarding maps for ammunition depots; digital terrain data and models for command and control, communications, intelligence, surveillance, reconnaissance, simulation, weapons and geographic information systems; photomaps using air and satellite photography. Corps units, officers and soldiers were deployed on operations and conflicts of various types including: 1946 – staff posted to British Commonwealth Occupation Force, Japan 1955–1960 – Malayan Campaign, officers posted to Force Headquarters 1965 – 1st Topographical Survey Troop raised in Sydney NSW based at Randwick 1966–1971 Detachment 1st Topographical Survey Troop deployed with the 1st Australian Task Force in Vietnam, in 1967 re-designated A Section 1st Topographical Survey Troop 1975 – Cyclone Tracy – rapid response production of orthophotomaps and a senior Corps officer seconded as Staff Officer to the Army General commanding the emergency operations 1987 – Operation Morris Dance – rapid response mapping of Fiji 1988 – Operation Sailcloth – rapid response mapping of Vanuatu 1990–1991 – Operations Desert Shield and Desert Storm, Corps officers posted in United States and