As defined in the Treaty on Conventional Armed Forces in Europe (CFE), a self-propelled armoured fighting vehicle, capable of heavy firepower, primarily of a high muzzle velocity direct fire main gun necessary to engage armoured and other targets, with high cross-country mobility, with a high level of selfprotection, and which is not designed and equipped primarily to transport combat troops. Battle tanks are tracked armoured fighting vehicles which weigh at least 16.5 metric tonnes unladen weight and which are armed with a 360-degree traverse gun of at least 75 millimetres caliber. Treaty-limited piece of equipment under the CFE Treaty.