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.
Battle of Raseiniai
On 22 June 1941, the Northwestern Front had two mechanised corps, the 3rd Mechanised Corps (Major General Alexey Kurkin) had 31,975 men and 669 – 672 tanks and the 12th Mechanized Corps (Major General Nikolai Shestapolov) had 28,832 men and 730 – 749 tanks; only BT-7s and T-26 tanks were available.