Résumé
French Army infantrymen's are equipped today with a combat system called FELIN, which includes an infrared sighting device: the IR sight. One of the first manipulations learned by the soldier is the IR sight calibration. Currently, calibration training is a two-step process. The first step consists of practicing on a 2D WIMP software until making no mistakes. Then, the soldiers can apply his knowledge in the real situation on the shooting range. In this paper, we present an ad-hoc study of a learning method including a prototype in Virtual Reality for training on the FELIN IR sight calibration procedure. It has been experimented on real infantrymen learners in an infantry school. Results showed an attractive added value of Virtual Reality in this specific use case. It improved the learners' intrinsic motivation to repeat the training task as well as the learning efficiency. It also helped the training team to identify specific mistake types not detected by the traditional learning software.