The Type 90 (Japanese: きゅうまるしき せんしゃ Kanji: 90式戦車) is the current main battle tank (MBT) of the Japan Ground Self-Defense Force (JGSDF). It is built by Mitsubishi Heavy Industries and was designed as a replacement for all deployed Type 61s and a portion of their Type 74 tanks. After the adoption of the Type 74, the Japanese High Command was already looking for a superior, completely indigenous tank design to defeat the Soviet T-72. As a result, development of a prototype, the TK-X MBT began in 1982. Testing, improvements, and designs were modified and constructed until 1989 when Japan formally acknowledged the Type-90 in 1990.