Securitron The PDQ - 88b securitron ( also named the RobCo security model 2060 - B ) is a private security created and mass - produced by House Industries with the help of RobCo Industries . Privately and on a much smaller scale , another model was produced by the Big MT research company , who were primarily attempting to improve the original . They are commonly found patrolling The Strip . They can also be found around Big MT and inside the Lucky 38 . Characteristics . The PDQ - 88b securitron is a large , monowheel robot with a titanium alloy housing , resistant to shrapnel and small arms fire . The PDQ - 88b securitron is heavily - armed : its left arm contains a Glastinghouse X - 25 Gatling laser for medium range engagements , while its right arm contains a 9mm machinegun for close - range suppression and crowd control . However , these are only secondary weapons ; concealed compartments in its shoulders contain M - 235 missile launcher s for long range and surface - to - air engagements and a rapid - fire G - 28 grenade launching system for close range engagements . The robots also have onboard auto - repair systems to repair any damage sustained from combat . Thus armed , a securitron can handle nearly any combat situation . The PDQ - 88b securitron produced by House Industries supports only two operating systems : Mk I and Mk II . The Mk I operating system lacks drivers for the auto - repair systems and explosive weapons , limiting the robot ' s arsenal to the built - in X - 25 Gatling laser and the 9mm machinegun . The Mk II operating system enables the M - 235 missile launchers , the rapid - fire G - 28 grenade launching system and the auto - repair system . As estimated by Mr . House and Yes Man , the upgrade improves the combat effectiveness of each securitron unit by 235 % . The PDQ - 88b securitron produced by the Big MT company supports six operating systems : Mk I , Mk II , Mk III , Mk IV , Mk V and Mk VI . These gradually increase firepower and accuracy , efficiency of auto - repair systems and missile launcher capacity . House Industries . These are the models created by House Industries , the original creator of the PDQ - 88b securitron , with the help of RobCo Industries . After the Great War , they are almost all controlled by Mr . House , and can be upgraded via the platinum chip . Mark I . The securitron Mk I can only use the X - 25 Gatling laser and the 9mm submachine gun , and it cannot use its auto - repair systems . The unit ' s face is that of an American policeman . Mark II . Through the use of the platinum chip , the Courier may upgrade the securitrons of Mr . House or Yes Man at The Fort and around The Strip to the Mark II operating system . The securitron Mk II can use all the built - in weapons : the 9mm submachine gun , the rapid - fire G - 28 25mm grenade launcher , the M - 235 missile launchers , and the X - 25 Gatling laser system . However , outside of the Lucky 38 basement demonstration , it only ever uses the last 3 . It can also use the auto - repair systems , and its armor is increased . The unit ' s face is that of a American soldier wearing an M1 Combat helmet and smoking a cigarette . Big MT company . There is a new line of securitrons created in Big MT by Doctor 0 and his team to surpass the PDQ - 88b securitron created by House Industries and Robert House ( the latter considered by 0 to be his greatest enemy ) . These efforts succeeded to a degree , as a Mk VI securitron operating system was developed . However , these never reached full production , and as of 2281 , all of Big MT securitrons are either irreparably damaged or have gone berserk due to lack of maintenance for over 200 years . Because of this , they lack any functional armor , as well . . Berserk series . The face of the berserk PDQ - 88b securitron unit is a distorted face , similar to the " angry moon " featured in the film " " . The berserk model has the ability to use the rocket launchers in its shoulders and the laser in its arm , but not the grenade launcher or machine gun . Damaged series . The unit ' s face of the damaged PDQ - 88b securitron is the berserk one ' s face crossed out . It can use the grenade launcher and machine gun , but not the other weapons . Notes . Securitrons in the Mojave Wasteland are the hands , eyes and soldiers of Mr . House . Notably , they patrol the Strip and guard its north entrance . Like all robots , securitrons cannot be pick - pocketed , and attempting to do so will just trigger the securitron to say one of their quotes . The Courier may upgrade the units to the Mark II operating system through the use of the platinum chip . Those of Big MT , however , are all hostile to the Courier , with the exception of Muggy . Appearances . PDQ - 88b securitrons appear in " " and its " Old World Blues " .