Tank
Most modern tanks most often have four crew members, or three if an auto-loader is installed. These are the:
Historically, crews have varied from just two members to a dozen. For example, pre-World War II French tanks were noted for having a two-man crew, in which the overworked commander had to load and fire the gun in addition to commanding the tank. First World War tanks were developed with immature technologies; in addition to the crew needed to man the multiple guns and machine guns, up to four crewmen were needed to drive the tank: the driver, acting as the vehicle commander and manning the brakes, drove via orders to his gears-men; a co-driver operated the gearbox and throttle; and two gears-men, one on each track, steered by setting one side or the other to idle, allowing the track on the other side to slew the tank to one side.
Tanks in China
Chinese tank crews were trained under the supervision of Soviet specialists. The 200th Division was set up as the first mechanised division in the National Revolutionary Army by General Du Yuming, who was also its first commander. The tank regiments had 70 , 4 BT-5, 20 ( 92? ) CV-33 tanks. The armoured car regiment had around 50 BA armoured cars and 12 ( 18? ) Leichter Panzerspähwagen (Sd.Kfz. 221) armoured cars. The tank regiment consisted of four tank battalions. Each tank battalion had three tank companies. The tank regiments had approximately 200 armoured fighting vehicles (AFVs). The Nationalist government bought 88 T-26 tanks and BA-10 and BA-20 armoured cars. These AFVs and remaining German AFVs were deployed in the 200th Division and the division finally saw action in late 1938. Its first action was against the 14th Division in the Battle of Lanfeng. Following the division's combat in the Battle of Lanfeng and in operations afterward until September 1938 the division's original subordinate mechanized units were placed under direct command of the 11th Army, and the division was reorganized. It inflicted the devastating defeat upon the Japanese army at the Battle of Kunlun Pass. It suffered heavy losses after the battle at Kunlun Pass in an offensive against Batang, losing nearly two thirds of its strength and was rebuilt and reorganized. With the Soviet and Japanese non-aggression pact signing, this help from the Soviets went out the window and China started searching for allies. After signing the nonaggression pact with Germany and defeating the Kwangtung Army at Khalkin Gol, Russia started to withdraw its help from China.