Sentry Bot (Fallout 3)

Sentry bots are a model of robot found in the Capital Wasteland

Specifications
Sentry bots have two arms equipped with powerful weapons: a minigun or Gatling laser on their right, and a missile launcher on their left. All models have wheeled tripod legs.

They are programmed with an authoritative and professional military personality, in contrast to the "gung-ho" patriotic personality of the Mister Gutsy.

Gameplay attributes
Sentry bots are the highest-level robots in Fallout 3; they are extremely durable, possessing as much health as a deathclaw but lacking a weak point that could be targeted for additional damage. In fact, their heads are more durable than their torsos, though targeting the head yields a greater chance of a Critical Hit. Like other robots, sentry bots are equipped with a combat inhibitor and will frenzy if it is disabled. Although they are fast, they have a slow turning speed.

Sentry bots are among the toughest enemies in the game, and it is not uncommon to find sentry bots roaming the Capital Wasteland in groups of two or three at higher levels.

Sentry bot
Sentry bots come in many different guises, distinguishable by their paint, which shows their affiliation: Enclave, Brotherhood Outcasts, United States Armed Forces, etc.

Enclave sentry bot
Significantly darker in appearance, wearing matte black paint and dark red sensors, the Enclave model hosts improved systems. They appear at Raven Rock, as well as alongside certain Enclave squads found in the wasteland. In Broken Steel, they are encountered guarding sections of the Adams Air Force Base.

Strike team sentry bot
The most expensive option for recruitment in Operation: Anchorage is a winterized minigun variant sentry bot, costing 4 recruitment markers. In addition to the minigun variant, there is a Gatling laser equipped winterized sentry bot which was cut from Operation: Anchorage.

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 occasionally wandering around the Wasteland.

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

Named sentry bots

 * Sparky, found in the mobile base crawler.

Quotes
Sentry bots possess an authoritative array of speech programming, though it mainly expresses its current programming out loud, much like the protectron. However, sentry bots have a deeper voice, instilling fear in all.

Bugs

 * Outcast sentry bots will always spawn with the Gatling laser arm, despite resources for the minigun variants being present.
 * If you disable the sentry bot (using the Robotics Expert perk), the sentry bot will be disabled but will keep on performing the animation where it is disabled.