A 440mm, or "four-forty" as referred to by UNSC troops, is a UNSC heavy artillery weapon developed around 2552.
During a training mission on Onyx, one of the Spartan-III candidates mistook an explosion caused by an Onyx Sentinel for a 440mm piece.
- ↑ 1.0 1.1 Halo: Ghosts of Onyx, page 116
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