Tank
With World War II the multi-turreted tanks proved impracticable, and as the single turret on a low hull design became standard, crews became standardized around a crew of four or five. In those tanks with a fifth crew member, usually three were located in the turret (as described above) while the fifth was most often seated in the hull next to the driver, and operated the hull machine gun in addition to acting as a co-driver or radio operator. Well-designed crew stations, giving proper considerations to comfort and ergonomics, are an important factor in the combat effectiveness of a tank, as it limits fatigue and speeds up individual actions.
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.