A 440mm, or "four-forty" as referred to by UNSC troops, is a UNSC heavy artillery weapon developed around 2552.[1] It is one of the largest caliber UNSC weapons.

History[edit | edit source]

During a training mission on Onyx, one of the Spartan-III candidates mistook an explosion caused by an Onyx Sentinel for a 440mm piece.[1]

Appearances[edit | edit source]

Sources[edit | edit source]

  1. 1.0 1.1 Halo: Ghosts of Onyx, page 116

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