Hardboiled Android
Vault Fossil
Edit; even if the Enclave had set up that Vault in the Capital Wasteland. What for? Why use some civilians for FEV research when they have a fully equipped laboratory manned by what was left of the scientific elite in the US.
Certainly not safety precautions, the Enclave oil rig was guarded and protected by soldiers in power armor, automated turrets, and robots.
more test results are always better.