Sentry Bot

Sentry bots are a type of robot found in the Commonwealth and Nuka-World in 2287.
Background The heaviest class of combat robot in the United States Armed Forces, the sentry bot's singular purpose is to provide security through overwhelming firepower. The sentry bot had become a standard piece of military equipment by at least 2063, with prototypes existing further back. The sentry bot's purpose is to engage the enemy at range with a variety of weapons, including miniguns, Gatling lasers, rocket launchers, and even back-mounted cluster grenade launchers. At the same time, its thick armor and multiple redundant systems allow it to survive extended engagements. It is commonly considered to be one of the most dangerous robots ever created and RobCo Industries' finest fighting robot. Late models are also provided with the ability to self-destruct to prevent the enemy from recovering the robot. Early sentry bot models were issued serial numbers in the SB-#### format (model, then serial), with later models transitioning to the standardized alphanumeric registration in the ABC-###### format.
Characteristics The Commonwealth variants of the sentry bot are similar in overall appearance to the ones encountered in the Capital and Mojave Wastelands, but are even larger (on par in height to a human wearing power armor and nearly twice as wide), appear to have a bulkier construction and are substantially more resilient. The typical weapons loadout of the sentry bot remains the same as seen in Fallout: New Vegas, with a missile launcher and minigun being the norm (except these miniguns appear to be unique 3 barreled variants chambered for the 5.56mm round). However, alternate weaponry configurations such as dual miniguns can also be observed. Annihilator sentry bots may also possess dual back-mounted mortar launchers, further enhancing their offensive capabilities.
On top of their already formidable ballistic and explosive weaponry, sentry bots now have powerful melee attacks and a self-destruct function with equivalent power to a mini nuke. They seem more durable than previous iterations of the sentry bot in other games, however despite being extremely bulky their mobility if anything has actually improved; they are capable of moving stunningly fast and traversing extremely rough terrain (even scaling rocky outcrops with little difficulty that the Sole Survivor would struggle to jump up on). In addition; a sentry bot's entire torso is capable of rotating independently of its legs, functioning akin to a turret and allowing it to move in one direction while shooting in a different direction (potentially against targets directly behind it).
A similar variant to the Commonwealth sentry bots can be found in Fallout: New Vegas at the REPCONN headquarters museum. Newer versions in Fallout 4 appear to use Mecanum wheels that allow it to strafe right and left without having to turn.
Variants Sentry bot Gunner sentry bot Siege breaker sentry bot Gunner siege breaker sentry bot Annihilator sentry bot Gunner annihilator sentry bot Annihilator sentry bot Mk II Gunner annihilator sentry bot Mk II Combat sentry prototype MkIV Sentry bot ripper Sentry bot lament Sentry bot carnage Sentry bot butcher Sentry bot reaper Space sentry Space sentry breaker Space sentry annihilator Space sentry obliterator