The helicopter simulator/trainer was adapted for Australia. The customer demanded to add a kangaroo herd as a detail of the landscape. The performer acted harshly, made a kangaroo model and glued it with the copy/paste method to the infantry logic, changing only the movement module. As a result, when the helicopter at the reception passed over a herd of kangaroos, they dispersed, re-grouped and shot down the helicopter with a rocket on the second stop.