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.
Oshkosh M911
In the second half of the 1970s, the US Army procured 1,000 of the heavy-haul truck - together with the four-axle M747 semitrailer - for road transportation of Main battle tanks
and other heavy loads. A tank often carried by the Oshkosh M911 was the M47 Patton. The Oshkosh M911 was also used with the US Army units stationed in Europe.
The Oshkosh M911 has a crew of 3, weighs 18.2 tons, and has a payload capacity of 68.95 tons. The Oshkosh M911 has a turbocharged 12-liter Diesel V-8 engine that produces 435 horsepower.