The EAW-25/4 Chimera Heavy Weapons Platform is used to control the airspace over Helghast-occupied territory. Liquid hydrogen circulates through helical channels along the four barrels, allowing the heavy weapons platform to maintain a continuous, high-rate fire without overheating.
The weapon can be situated on its quadpod base or it can be mounted on top of the Helghast hover APC, giving the Helghast mobile AA firepower.
Later in the Second Extrasolar War, the EAW-25/4 Chimera is replace by the more advanced VC25 AA Cannon.

The Emplaced StA3 LMG, with an added protective armored screen, is effective for sustained fire over a longer range than the standard issue StA3 LMG, and like the standard version it is manufactured by Stahl Arms. The tripod offers its user a pitch of 100 degrees vertically and 75 degrees horizontally. The added protection does affect the cooling mechanism of the gun, so extensive firing leads to overheating, rendering the gun inoperable until it cools down which could turn things deadly.

The M10 Quad Cannon is an AA (Anti-Air) cannon used by ISA Cruisers; it is very similar to the Helghast VC25 AA Cannon. It is somewhat more advanced than the VC25, however, as it has a protective pod for the user and a locking system. It has 4 automatic anti-aircraft cannons, as well as a guided missile launcher for tougher targets. The AA guns fire solid slugs instead of fragmentation shells.
Its cockpit features four large guns, supported by a reinforced and pivoting arm, which gives the M10 AA an impressive pitch and yaw. The cockpit offers gunners a fighter pilot-styled targeting system, including an interactive heads-up display with 4x zoom capability.

The M224 MOMAG (Mounted Machine Gun, often referred to as simply "MG") is the most common of all ISA emplaced weapons and is manufactured by ISA. It relies on its fire rate, rather than stopping power, to counter enemy advancement.

The VC25 AA Cannon is the Helghast AA (Anti-Air) quad cannon and is manufactured by Visari Corporation. It is equipped with four medium-sized cannons firing heavy caliber explosive and armor-piercing rounds. It is an updated version of the trusted EAW-25/4 Chimera and features improved pitch and elevation speeds to easily track fast-moving targets, and a higher rate of fire with the same reliable cooling system.

ecause of similar feeding and cooling mechanisms, the VnD-10M Siren resembles a bigger, heavier brother of the VnS-10 Scylla mounted machine gun. It is in fact a very different kind of weapon, spewing grenades instead of bullets at a much lower fire rate. It has proven to be very effective against squads of infantry and light armored vehicles.

The VnS-10 Scylla is the standard mounted machine gun of the Helghast army. To allow for uninterrupted fire, a water-filled sleeve is rotated around the barrel in synchronicity with the fire cycle to keep the weapon from overheating. The weapon is also available in a slightly smaller portable version for easy transport in places like the mountains and swamps in Vekta.

And These are the Emplaced Weapons