main battle tank
Military term for a modern armored fighting vehicle that serves as the primary direct-fire and maneuver element of ground forces.
The main battle tank of the Japan Ground Self-Defense Force is the Type 10 tank.
戦車 is a general term for tank, while 主戦闘戦車 specifically refers to a main battle tank, the primary armored vehicle in modern armies.
Compound of 主 (main), 戦闘 (combat), and 戦車 (tank). The term is a direct translation of the English 'main battle tank'.