440 mm heavy artillery
Production information
Type	Artillery
Technical specifications
Ammunition Type	440mm shells (assumed)
Usage
Era(s)	Human-Covenant war
Affiliation	UNSC
[Source]

A 440mm, or "Four-Forty" as referred to by UNSC troops, is a UNSC artillery weapon developed around 2552.^[1] As an artillery piece, it is most likely used to destroy enemy forces from a distance, providing indirect fire support for ground troops. It may be an explosive shell, or, more likely, an artillery rocket.

Contents 1 Background 2 Size issue 3 List of appearances 4 Sources

BackgroundEdit

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]

Size issueEdit

The size of the projectile causes something of a discrepancy. If it is indeed 440mm, then it is unnecessarily large for an artillery piece especially given the UNSC's use of missiles and rockets instead. If it is .440, then it seems too small. However, if the .440 artillery uses coilgun or railgun technology, then the size makes much more sense - the kinetic energy imparted by an electromagnetic projectile weapon means that the projectile does not need to be particularly large, or even explosive, to inflict tremendous damage upon a target. If it is 440mm, then it may be a ground-based anti-ship weapon. For now, either theory remains conjecture. When contacted, even Eric Nylund could not explain such an oddity. He mentioned, however, that a 440mm cannon could be used against orbital installations.^[2] This however, would only make sense if the weapon was a direct-fire anti-ship magnetic cannon. A .440 magnetic cannon could not be considered artillery, because it would not be an indirect fire weapon, leaving the 440mm as the only possibility.

It is also entirely possible that the 440mm is a mortar weapon, similar to large scale World War 2 mortars, like the 380mm Sturmtiger or the 600mm Karl-Gerät.

List of appearancesEdit

• Halo: Ghosts of Onyx (First appearance)

SourcesEdit

List of UNSC Vehicle-mounted Weapons and Explosives
Artillery	102mm SC-HE rocket turret • 440 mm Heavy Artillery • KG Mk 34 Antipersonnel Flame Mortar Launcher • XM511 Heavy Grenade Launcher • MG460 Automatic Grenade Launcher
Autocannons	AAA Helix Gun • Point-defense gun • 110mm Rotary Cannon • 120mm Ventral Gun • GUA-23/A Heavy Autocannon • GUA-23/AW/Linkless Feed Autocannon • M1024 ASW/AC 30mm ALA Cannon • M370 Autocannon
Chemical weapons	Narcozine Gas • VX 7 Nerve Gas
EMP Weapons	X23 NNEMP Cannon
Magnetic Acceleration weapons	LRG Rail Gun • M68 ALIM • Magnetic Accelerator Cannon • M2488 Onager MAC
Machine guns	AIE-486H HMG • M247 GPMG • M247H HMG • M41 LAAG • M46 LAAG
Land mines and conventional bombs	Antlion Anti-Personnel Mine • Asteroidea Anti-Personnel Mine • Lotus Anti-Tank Mine • GBU-1105 Cryo Bomb • Mark 208 Bomb • TR/9 Antipersonnel Mine • Type 14 Magnetic/Anti-Tank Mine • Unidentified UNSC bomb • XGBU-302 Disruption Bomb
Missiles	Anaconda surface-to-air missile • ANVIL-II ASM • ANVIL-IV ASM • A-74 Sylver Vertical Missile Launcher • Archer Missile • Ares Missile • Argent V missile • ASGM-10 Missile • Class-2 Guided Munition Launch System • M75 Rapier Missile • M79 MLRS • M96 Howler Missile • Medusa Missile • Scorpion missile
Nuclear weapons	FENRIS Nuclear Warhead • Fury Tactical Nuclear Weapon • Medium Fusion Destructive Device • HAVOK Tactical Nuclear Weapon • NOVA Bomb • Shiva-class Nuclear Missile
Space mines	HORNET Mine • Moray space mine
Tank guns	M512 90mm SBHV Cannon • M310 120mm SBHV Cannon

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