Without a doubt, the Leopard 2 is one of the most popular main battle tanks in the world. In Southeast Asia, it is being operated by Indonesia and Singapore, Leopard 2RI and Leopard 2SG respectively. They’re basically an upgraded Leopard 2A4. The Leopard 2SG’s protection level and ability to function day and night gives Singapore’s ground forces a superb fire support vehicle in any conflict scenario where the full brunt of their mechanized fleet is required.