The reuse of some code had caused tactical headaches for Australia's armed forces. As virtual reality simulators assume larger roles in helicopter combat training, programmers have gone to great lengths to increase the realism of their scenarios, including detailed landscapes and -- in the case of the Northern Territory's Operation Phoenix -- herds of kangaroos (since disturbed animals might well give away a helicopter's position). The head of the Defence Science & Technology Organisations Land Operations/Simulation division repeatedly instructed developers to model the local marsupials' movements and reactions to Helicopters. Being efficient programmers, they just re-appropriated some code originally used to model infantry detachment reactions under the same stimuli, changed the mapped icon from a soldier to a kangaroo, and increased the figures' speed of movement. Eager to demonstrate their flying skills for some visiting American pilots, the hotshot Aussies "buzzed" the virtual kangaroos in low flight during a simulation. The kangaroos scattered, as predicted, and the visiting Americans nodded appreciatively... then did a double take as the kangaroos reappeared from behind a hill and launched a barrage of Stinger missiles at the helpless helicopter. (Apparently the programmers had forgotten to remove THAT part of the infantry coding.) The embarrassed programmers had learned to be careful when reusing old programming code, and the Yanks left with a newfound respect for Australian wildlife.