This is the story of a lone wander from vault 101 who felt his patriotic duty.
The story opens on a lone wander in a water purifier who is calmly talking with a Enclave officer about sabotaging the brotherhood and handing over the purifier to the enclave. The officer said he would have the gratitude of the American people and have a place in the Enclave. So after deceiving the brotherhood into thinking he was one of them he got the GECK and "accidentally" lost it to the Enclave and gave us the code. Before Lyons pride moved out the wander reprogrammed Liberty Prime to be loyal to the Enclave.
Liberty Prime is online. All systems nominal. Weapons hot. God Bless the Enclave.