Sentry Bot

A Sentry Bot is a robot that appears in 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 if damaged. Sentry Bots possess judicial circuits, which are employed when they witness a murder or thievery, and will hand out death sentences to the criminals they find. 

Sentry Bot


Sentry Bots have paint jobs that shows their affiliation, including Enclave, Brotherhood Outcasts, and United States Armed Forces. They guard vaults such as the sacrificial chamber in Vault 11 and the Securitron Vault. They were also used in the Battle of Anchorage. In the Mojave's REPCONN Headquarters, an Antique Sentry Bot is part of a museum exhibit, with the following placard.

Enclave
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
They can be encountered at Fort Constantine, the National Guard depot and when wandering around the wasteland

Strike Team


The most expensive option for recruitment in Operation Anchorage is a winterized sentry bot, with a built-in minigun and missile launcher, costs 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
Encountered along with hardened Mister Gutsies around the crashed vertibird in the Mojave Wasteland.

Mk Series
Appears only

Sentry Bot
If engaged in combat for too long, they will eventually enter a cooldown period, blasting steam and flames out of vents on their chest and back while exposing dual fusion cores on their rear. Upon taking terminal damage, the Sentry Bot will initiate a self-destruct sequence. After a few seconds, they will explode. Additionally, the loss of both main weapons will prompt the Sentry Bot to initialize their self-destruct sequence and charge at their target.

Siege Breaker Sentry Bot
Slightly upgraded version of the normal sentry bot, only appearing in Fallout 4.