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.
DC-10 Air Tanker
The DC-10s operate with a flight crew of three, a pilot, co-pilot and a flight engineer. The tanker works with a lead plane and can be an effective tool in combating wildfires when working directly with ground resources. 10 Tanker Air Carrier added a second DC-10 (N17085), formerly flown by Continental Airlines, to its fleet in July 2008, to be used on an on-call basis. On December 19, 2009, the aircraft – designated Tanker 911 – arrived in Melbourne, Australia, for the Australian fire season. Leased by the National Aerial Firefighting Centre on behalf of the Victoria state government, the DC-10 became operational in Australia in early January 2010, based at Avalon. The Premier of Victoria at the time, John Brumby, described the leasing of the tanker as being part of a record financing program to make sure the state was as fire-ready as possible. In late 2014, the company added two additional DC-10s which had previously served with Omni and Northwest Airlines, N612AX and N522AX, which were numbered as Tankers 910 and 912 respectively. The original aircraft, N450AX, was subsequently withdrawn from use in November 2014.