Coil spring: a helical metal spring used in vehicle suspension to absorb shocks and maintain wheel contact, compressing under load.

A tank with heavy armor and firepower, prioritizing protection over mobility.

Manual: a tank transmission in which the driver selects gear changes manually, typically using a clutch pedal and gear lever to engage gears.

A refined product derived from crude oil, used as a fuel for internal combustion engines. A volatile, flammable liquid mixture of hydrocarbons.

A rifled gun has spiral grooves cut into its barrel.