A wastelander by birth, the Enclave recruited Stiggs when he was malnourished, and brought him back to health from severe bouts of radiation poisoning. He was then put to work maintaining and creating the latest in flamethrower technologies for the Enclave; accomplishments he is troubled by. It is interesting to note that although he was not born in the Enclave, they still rescued him and used his expertise in robotics.
Who Dares Wins: Stiggs approaches you on the lower level of the mobile platform and asks if you are going to hurt him. If you let him live, he can give you some information about the crawler. A dialogue option opens up if you have the Robotics Expert perk, where your character speculates what system the mainframe uses. He will compliment you as finally being someone who understands what he's talking about, and says you'd be able to reprogram the robotic and turret systems inside the base so that they will target the Enclave instead of you.
"Well, just above us is a deathclaw research facility. Most of the deathclaws are out fighting, but there might be one or two left. here are also a bunch of robots in the facility, and they're all controlled through the mainframe. There are also some military types left but not nearly as many as there used to be."