Sentry Bot

A Sentry Bot is a robot that appears in Fallout 2, Fallout 3, Fallout: New Vegas, Fallout 4 and Fallout 76.

Background
The sentry bot was created to provide security through overwhelming firepower. The sentry bot has a cool down phase after attacking, which results in its fusion core being vulnerable. The combat drone utilizes a variety of heavy weapons systems and explodes upon death. Sentry Bots use a minigun or Gatling laser on the right arm, and a missile launcher on the left. The robots have a combat inhibitor on their back that will cause it to frenzy when destroyed.

Antique
A exhibit version that is inside the REPCONN Headquarters museum, manufactured by RobCo.

Sentry Bot


The sentry bot can be found in the toxic caves and the Sierra Army Depot. The Enclave use them on Control Station ENCLAVE.

RobCo Industries early model


 An early sentry bot model developed by RobCo Industries, designed specifically for heavy combat. The bot is divided into two halves. The upper body contains the central processing unit, power core, and mounts the primary optical receptor. The bot is protected by a cast armored shell, consisting of just three pieces: The torso and upper assembly, a separate rear plate giving access to internal mechanics, and the head assembly protecting the main optical receptor. Its arms act as hardpoints, accepting a variety of weapons including miniguns, Gatling lasers, and rocket launchers. The lower body is connected by four shock absorbers and a centrally-mounted duct. It contains fans venting accumulated hot air outside the chassis, preventing overheating. For movement, the lower body is fitted with three independent legs that provide it with a stable firing platform in any environment, much like a machine gun mount. The legs terminate in semi-spherical wheels (rubberized on the front and solid steel scoops on the back), giving it excellent mobility as well. Unlike the Gutsy or Assaultron, all sentry bots come with a simple synthetic personality. 

RobCo Industries late model
 It contains two distinct assemblies. The upper body, protected by a rounded, cast armored shell, contains the primary systems of the sentry bot together with the fusion core sockets. A pair of large fans help cool down the torso assembly, while hinged flaps over the fusion cores allow for emergency venting if heat buildup reaches critical levels (its only major vulnerability). 

Enclave sentry bot


Slightly darker in appearance when compared to the normal variant, the Enclave model boasts improved systems. They appear at Raven Rock and alongside Enclave squads in the wasteland. During Broken Steel they are encountered guarding Adams Air Force Base.

U.S. Army sentry bot


Military robots from before the Great War painted in the characteristic olive green of the U.S. Army. They can be encountered at Fort Constantine, the National Guard depot and when wandering around the wasteland.

Strike team sentry bot


The most expensive option for recruitment in Operation Anchorage is a winterized sentry bot, with a built-in minigun and missile launcher, costing 4 recruitment markers.

Presidential metro sentinal unit


This unique sentry bot is encountered in Broken Steel, at the end of the Presidential metro, near the metro to Adams Air Force Base. It holds the main fuse, which is needed to repair the nearby powerbox for the metro.

Hardened sentry bot


A hardened sentry bot is a hardened version of the military sentry bot. They are Enclave affiliated, encountered along with hardened Mister Gutsies around the crashed vertibird in the Mojave Wasteland.

Mark series


The sentry bot mark series appears only in the Fallout: New Vegas add-on Old World Blues.

NCR sentry bot


It is similar to the military sentry bot in appearance but is differently colored, with orange eyes instead of the standard red. The NCR sentry bot was originally intended to be stationed in Camp McCarran, evident in its G.E.C.K. id McCarranFieldSentryBot, but was cut from the final version of Fallout: New Vegas.

Siege breaker sentry bot


A siege breaker sentry bot is a slightly upgraded version of the normal sentry bot, only appearing in Fallout 4. They can be dangerous opponents for lower level players.