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Sentry deploy.gif
"Xenoforms spotted!"
TSA.png Frontiersmen
Team Resources
Icon team resource neutral.gif 5
Icon marine supply.gif 10 / 200
Abilities and Upgrades
Gatling Gun, Recycle
Tech Requirements:
Robotics Factory, Build Near Sentry Battery, 3 Sentries per battery
Build Time: 3 seconds
Builds From: Marine Commander
Buy From: Advanced Tab
Hotkey: A


The Sentry is the Frontiersmen static defense created by the Marine Commander. Marines or MACs are required to assemble a Sentry Battery to provide power to Sentry turrets, and only three Sentries can be built next to each battery.

When powered, the Sentry will periodically scan in a 160 degrees arc. Any Kharaa lifeforms and structures that enter the Sentry's range, while not under the effects of Cloak or Phantom, will be targeted by the turret. Lerk Spore clouds and Onos Stomp can interfere with Sentry target detection and cripple the turret's rate of fire.


Passive Abilities

Gatling Gun

Sentries shooting an Onos

Gatling Gun
The Sentry's gatling gun can continuously fire bullets manufactured by nanites.
Damage 5
Type Normal
Range 20
Interval 0.15 seconds
Targets Lifeforms, structures
Requires Nearby Sentry Battery

Triggered Abilities


Recycling a structure

Recycle enables the Marine Commander to return a portion of Team Resources by recycling a structure. The recycling process lasts a short duration, after which a maximum of 75% Team Resources used to create the structure is refunded. However, the amount of Team Resources refunded depends on the remaining health of the structure on recycle completion. The higher the structure's health, the more resources are refunded.

Recycle buildmenu.png
Recycles the structure over time and refunds resources based on initial cost and current Health. Recycle can be canceled by Marine Commander or by destroying the structure.
Hotkey V
TRes Icon team resource neutral.gif 75% x initial cost
Duration 6 seconds


  • Sentry turrets can only receive power from the Sentry Battery. Use this to your advantage to deter Kharaa lifeforms from lingering in unpowered rooms.
  • Bile Bomb can destroy Sentries quickly if no Marine is nearby to repair the structures.
  • Position your Sentries to cover each other for 360 degrees protection.