Abstract: A gunnery training system comprises a conventional armored vehicle having a gun and a fire control system to which is releasably attached portable training equipment (TT), which in operation uses almost all features of the conventional equipment within the vehicle so that a high standard of realism is obtained. The equipment (TT) delivers simulated scenic images with overwritten simulated target images to the visual display of the vehicle, the scenic images being selected by gun orientation signals extracted from the fire control system. Initiation of the laser rangefinder which forms part of the fire control system causes the equipment (TT) to deliver range data on the simulated target so that the fire control system overwrites a corresponding aiming mark on the visual display. When the gun trigger switch is operated the equipment (TT) captures the location of the aiming mark and computes the displacement between that location and the position of the simulated target as a measure of training efficiency.