Tank

A Tank is an armored fighting vehicle designed for front-line combat which combines operational mobility and tactical offensive and defensive capabilities. It may refer to the following:
*M808B Main Battle Tank - The UNSC Main Battle Tank.
*M820 Main Battle Tank - The UNSC post-war replacement of the M808 Main Battle Tank.
*M850 Main Battle Tank - A modified, more heavily armored variant of the M808.
*M-145D Mobile Artillery Assault Platform - A prototype plasma-firing tank deployed by UNSC.
*Type-26 Assault Gun Carriage - The Covenant Main Battle Tank.
*Type-52 Anti-Aircraft Artillery - Anti-Air variant of the Wraith.
Tank can also refer an enclosed heavily armed unit.
*Flood Tank Form- A Flood Pure Form derived from a mutating Stalker Form.
Tank could also refer to a container, usually for holding liquids, sometimes for compressed gases (gas tank).
*Methane Tank - A Methane container used by the Unggoy to breathe in non-methane rich environments.
*Battlefield methane tank - A portable methane container used by the Covenant.