Since 1990, the Leopard 1 has gradually been relegated to secondary roles in most armies. The Leopard quickly became a standard of many European militaries, and eventually served as the main battle tank in over a dozen countries worldwide, with West Germany, Italy and the Netherlands being the largest operators until their retirement.

In total, 6,485 Leopard tanks have been built, of which 4,744 were battle tanks and 1,741 were utility and anti-aircraft variants, not including 80 prototypes and pre-series vehicles. The design started as a collaborative project during the 1950s between West Germany and France, and later joined by Italy, but the partnership ended shortly after and the final design was ordered by the Bundeswehr, with full-scale production starting in 1965. The main armament of the Leopard consisted of a German license-built version of the British Royal Ordnance L7 105 mm rifled gun, one of the most effective and widespread tank guns of the era. This, coupled with a modern suspension and drivetrain, gave the Leopard superior mobility and cross-country performance compared to most other main battle tanks of the era, only being rivaled by the French AMX-30 and Swedish Strv 103. It featured moderate armour, only effective against low caliber autocannons and heavy machine guns, giving it a high power-to-weight ratio.

Developed in an era when HEAT warheads were thought to make conventional heavy armour of limited value, the Leopard design focused on effective firepower and mobility instead of heavy protection. The Kampfpanzer Leopard 1 (also styled Leopard I, before the Leopard 2 simply known as the Kampfpanzer Leopard) is a main battle tank designed by Porsche and manufactured by Krauss-Maffei in West Germany, first entering service in 1965.

1/35 scale modern us tank crew