From the Leopard 2 Imp was then developed into the A5. There were also some improvements in the main armour composition. The interior received spall liners to reduce fragments if the armour is penetrated. The frontal "heavy" third of the side skirts was replaced with a stronger type. The commander's sight was moved to a new position behind the hatch and it received an independent thermal channel. The gunner's sight was moved to the turret roof as opposed to the cavity in the front armour in previous models. A heavier sliding driver's hatch was fitted. Turret controls went all-electric, increasing reliability and crew safety, as well as weight savings. The gun braking system was improved to prepare for the later mounting of the new L/55 gun tube and to enable firing of more powerful ammunition, such as the DM-53 APFSDS. The first A5s were handed over to the German army tank school in 1995 and started to enter regular service with Panzerbataillon 33 in December the same year.