Sentry Bot (Fallout 3)

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

Sentry Bot
Sentry Bots have paint jobs that shows their affiliation, including Enclave, Brotherhood Outcasts, and United States Armed Forces.

Enclave
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
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
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

 * Sparky, found in the mobile base crawler.

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.