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This article is about Gauss cannon featured in Halo 2 and Halo 3. For other Gauss cannon models, see Gauss cannon.

M68 Asynchronous Linear-Induction Motor
Production overview
Manufacturer:	Misriah Armory
Type:	Gauss cannon
Variants:	M68B Gauss cannon
Specifications
Length:	3.0 meters (9.7 ft)
Weight:	243 pounds (110 kg)
Ammunition type:	25x130mm APLP/F 25x130mm M485 HV/FTHPP
Feed system:	750 rounds
Operation:	Coilgun
Rate of fire:	Semi-automatic
Muzzle velocity:	~Mach 1
Effective range:	8 kilometres (5.0 mi)
Service history
In service:	Human-Covenant War Post-Covenant War conflicts

The M68 Asynchronous Linear-Induction Motor is a model of Gauss cannon used by the armed forces of the United Nations Space Command. While overshadowed by its more common M68B variant, the M68 was used during the Human-Covenant War as an anti-armor weapon capable of firing hypervelocity, high-density projectiles. Also known among the troops as the "68," "Rail Gun," "Tent Pole," and the "Gas Gun," it can be mounted on a stationary stand, or on the rear of the M12G1 Warthog LAAV.

, more commonly known as the M68 Gauss Cannon (named after nineteenth century physicist Carl F. Gauss), is a weapon that fires hyper-velocity, high-density projectiles similar to those of a Magnetic Accelerator Cannon, except on a much smaller scale.

Overview

Design details

Despite its name, the M68 does not operate as a Gauss gun, instead named after the 19th century mathematician Carl Friedrich Gauss - the pioneer for the underlying technology behind the weapon. As with other Gauss cannons, the M68 fires using asynchronous linear induction motors; using staged electromagnets that turn on-and-off in sequence to accelerate the projectile inside the barrel.

Design details

Operation

The M68 ALIM uses an asynchronous linear-induction motor to produce a bipolar magnetic field capable of launching a 25x130mm projectile at an incredible speed of just under Mach 40, or approximately 13.7 km per second. The great velocity of the projectile is the key to the stopping power and performance of the Gauss cannon, giving it exceptional armor penetration at impressive ranges.

When modified, Gauss cannons are capable of firing the Anvil round, a special kind of ammunition capable of causing an EMP in the target area and doing more damage than standard munitions.

Role

The M68 ALIM is primarily used in an anti-vehicle capacity by UNSCDF ground forces, though it can be used to devastating effect against infantry. It is often seen mounted on the Warthog in the same manner as the M41 LAAG, and while it does not possess the LAAG's extreme rate of fire, it displays near-pinpoint accuracy and overwhelming firepower, usually killing infantry targets with a single shot, and heavily damaging those in the immediate vicinity of where the round impacts. Its intended usage is similar to that of a M39 rocket turret, though the rocket turret does not possess the all-around utility and adaptability of the M68 ALIM and causes much more collateral damage.

Advantages

The M68 is an extremely accurate weapon, useful against most enemy infantry and vehicle units. Unsurprisingly it has proven to be devastating against light-armored vehicles; it can take out a Karo'etba-pattern Ghost or a Banshee in one or two shots (depending on shot placement). The weapon is rather effective against Wraiths as well, provided the driver can out-flank the Wraith and fire upon its unprotected backside before it brings its plasma mortar to bear. Firing at the vehicle's armored front is less effective, but the rate at which the weapon cycles can compensate for this. The M68 is also very deadly if used against infantry, however users should aim at the most dangerous units like Sangheili, Jiralhanae and Mgalekgolo in order to make full use of the weapon before moving onto smaller, less dangerous targets. Its relatively high rate of fire, when compared to other electromagnetic accelerator weapons, makes it a devastating precision weapon on any battlefield. Its anti-armor capabilities are second only to those of the SP42 Cobra's mounted M66 light rail gun, and static defense platforms, such as the Onager, and its portability more than makes up for this.

Disadvantages

The M68 has few disadvantages, mainly the fact that the weapon (like all other vehicle-mounted turrets) offers little to no protection to the operator, and allows them to be easily sniped without the presence of a skilled driver. It lacks precision at extreme distances, but can still hit large targets (i.e. Wraiths and Phantoms) with a fair degree of accuracy. The Gauss Cannon can also cause permanent hearing damage when fired within 20 meters of unprotected infantry.

Tactics

• The M68 is (unsurprisingly) an excellent anti-vehicle weapon. It will get rid of enemy light armor rather quickly.
• While not as effective against entire squads, it remains good against single infantry units.
• Outstanding against Scarabs in Halo 3, since the Warthog on which the weapon is mounted is a smaller, faster target for it to hit. An effective tactic is to remain under the Scarab, avoiding the legs and the main gun, while your Marine gunner targets the Scarab's legs. Doing this with a co-op player is even more effective.
• Experienced gunners using this weapon can effectively use the cannon's extremely high damage and accuracy to 1-shot kill most enemies. This has led to many Gauss gunners being able to attain high multi-kills and killing sprees, especially in multiplayer. Perfections are also not unheard of, especially if the hog the cannon is mounted on is parked away from the main battlefield.

Production notes

The Gauss cannon's design originates in the pre-Xbox era of Halo: Combat Evolved's development. At this early stage of production, Halo was intended to feature a Rocket Warthog, fitted with a turret with an extraordinarily similar design to that of the M68 Gauss cannon. The Rocket Warthog was ultimately cut from Halo, with an alternate rocket turret design created when the game was ported to PC. As such, when Halo 2 was in production, the Rocket Turret's design was brought back, now-reworked as the Gauss cannon.

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  The cut Rocket Turret.

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  The cut Rocket Turret, aft view. Note the exhaust tube extending behind the operator's shoulder; in Halo 2 this was reworked and replaced with the Gauss cannon's rotary magazine.

Disrepancies

• The muzzle velocity of the M68 has been up for some dispute between sources. Early sources including the Halo: Evolutions short story Palace Hotel and Halo: The Essential Visual Guide note the Gauss cannon's muzzle velocity to be Mach 40 - a massive number well beyond the escape velocity of Earth, and unrepresentative of the cannon's projectile seen in the Halo games. More recent sources, including the Halo Encyclopedia (2022 edition), have toned down this figure significantly, noting that Gauss cannons fire their projectiles at speeds "approaching Mach 1" - something more representative of the Gauss cannon's in-game behaviour. As such, this page uses the latter figure.
• In the 2009 and 2011 editions of the Halo Encyclopedia, the M68's length was noted as 291 centimeters (114.7 in). This figure was updated in the 2022 edition to 3.0 meters (9.7 ft).

Gallery

Browse more images in this article's gallery page.

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  The M68 ALIM in Halo 2.

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  HUD of the M68 in Halo 2.

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  A Gauss slug of the M68 Gauss cannon from The Art of Halo 3.

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  A Gauss Warthog on Last Resort in Halo 3.

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  HUD of the M68 in Halo 3.

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  A closeup of a Gauss cannon's projectile in the air. Note that the contrail starts out blue but fades to yellow in Halo 3.

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  A Marine fires a Gauss cannon in Halo 3.

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  John-117 firing a Gauss cannon in Halo 3.

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  Turnaround reference image of the mounted stationary Gauss cannon in Halo 3: ODST.

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  The stationary variant of the Gauss cannon in Halo 3: ODST.

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  The Rookie inspecting a destroyed Gauss cannon in Halo 3: ODST.

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  Taylor Miles manning a stationary Gauss cannon in Halo 3: ODST.

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  Gauss cannons in Halo Wars.

List of appearances

• Halo 2 (First appearance)
• Halo: Uprising
• Halo 3
• Halo Wars
• Halo 3: ODST
• Halo: Evolutions - Essential Tales of the Halo Universe
  • Palace Hotel
• Halo: Envoy
• Halo: Retribution (Mentioned only)
• Halo: Oblivion
• Halo: Hippocratica