Sentry Bot (Fallout 3)

Sentry bots are a model of robot found in the Capital Wasteland after 2277.

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, professional, military personality, in contrast to the "gung-ho", patriotic personality of the Mister Gutsy.

Gameplay attributes
Sentry bots are extremely durable, possessing as much health as a deathclaw but with greater Damage Resistance. Also, they do not have a weak point that can 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 the inhibitor is disabled. Exploiting this weakness can be helpful in dispatching other enemies, since sentry bots are among the most powerful foes in the game. Although they are quite fast, they have a slow turning rate, which can be used to the player's advantage.

Sentry bots are the highest-level robots in Fallout 3, and are more formidable opponents than protectrons, robobrains, and Mister Gutsy models.

Sentry bots are among the toughest enemies in the game and present a serious threat to any low level player unlucky enough to encounter one. It is not uncommon to find sentry bots roaming the Capital wastes in packs of two or three. These robots are mobile fortresses; their high level of health and lethality makes them the preeminent fighting machines of the Capital wastes.

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
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.

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. Unlike the other sentry bots, they don't have Gatling lasers.

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.

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 needs to be used to repair the nearby powerbox for the metro.

Notable quotes
Sentry bots possess an authoritative array of speech programming, mainly expressing its current programming out loud, much like the protectron. However, sentry bots have a "deeper" voice, instilling fear in all.
 * "Warning: use of lethal force is authorized!" Genericrobot_guardtrespass_00018e50_1.ogg
 * "Security lockdown in effect. Hostile target acquired!" Mq09_mq09robotproceed_00050fac_1.ogg
 * "Adding target to threat matrix!" Genericrobot_assault_00080da1_1.ogg
 * "Hostile detected. Commencing neutralisation." Genericrobot_alerttocombat_00080e1f_1.ogg
 * "Alert! Non combattants are advised to leave the area. Security sweep in progress. Lethal force may be used without warning." Genericrobot_alertidle_00080d95_1.ogg

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 he is disabled.

Gallery
Робот-Охранник Wachbot Robot strażniczy RNK Sentry Bot (辐射3) Robot centinela (Fallout 3) Robot Sentinella