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In these pensive days, where a backpacker on a bus could pose more of a threat than a cave-dwelling Taliban, Governments and corporations are hungry for technology that will help secure their people and resources. It has fed a boom in the defence tech sector; a world of cutting-edge machinery and multi-million dollar contracts, and home to some of the world's keenest strategic and technical minds. Several Australian companies are emerging as genuine players in this highly competitive space. Liz Heynes and Catherine Kerstjens take a look at six on this new front line.