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.
Cowboy
On average, a single herd of cattle on a drive numbered about 3,000 head. To herd the cattle, a crew of at least 10 cowboys was needed, with three horses per cowboy. Cowboys worked in shifts to watch the cattle 24 hours a day, herding them in the proper direction in the daytime and watching them at night to prevent stampedes and deter theft. The crew also included a cook, who drove a chuck wagon, usually pulled by oxen, and a horse wrangler to take charge of the "remuda," or herd of spare horses. The wrangler on a cattle drive was often a very young cowboy or one of lower social status, but the cook was a particularly well-respected member of the crew, as not only was he in charge of the food, he also was in charge of medical supplies and had a working knowledge of practical medicine.