This actually happened.

The reuse of some object-oriented code has caused some 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
Territories Operation Phoenix - herds of kangaroos (since disturbed
animals might well give away a helicopters position).

The head of the Defence Science & Technology Organisation's Land
Operations/Simulation division reportedly 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 figure's speed of movement.

Eager to demonstrate their flying skills for some visiting American
pilots, the hotshot Aussies 'buzzed' the virtual kangaroos in a low
flight during a simulation. The kangaroos scattered, as predicted, and
the visiting Americans nodded appreciatively....... and then did a
double take as the kangaroos reappeared from behind a hill and
launched a barrage of Stinger missiles at  the hapless helicopter.
(Apparently the programmers had forgotten to remove that part of the
infantry coding).

The Yanks left with a new found respect for Australian wildlife and
the Simulator supervisors report that the pilots from that point
strictly avoided kangaroos, just as they were meant to.

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