Returning the Favor

Returning the Favor is a Minutemen side quest in Fallout 4.

Detailed walkthrough
Speak to either Preston Garvey or Blake Abernathy to begin this quest. The Survivor learns that Mr. Abernathy's daughter, Mary, was killed by raiders, and he and his family would love to retrieve her locket, which has been a family heirloom for generations. The player is sent to the USAF Satellite Station Olivia.

Upon entering the building, there is an advanced terminal which unlocks the intel room. If the player does not have the necessary perk to unlock the advanced terminal, the intel room key can be found in an instrument case through a novice door by where the locket is found. Inside the intel room there is a novice safe, a duffle bag, a steamer trunk, a mini nuke, and a copy of U.S Covert Operations. One can go either right down the stairs or left down the hallway. Turning left leads to a metal walkway, passing a bathroom with a first aid kit in it. There is a novice chem box at the farthest right end of the walkway. Descending down the walkway leads to an encounter with Ack-Ack, who carries a minigun. In the room with the lockers, on the table with the radio, there is an overdue book. Mary's locket can be found in a toolbox in front of a novice door.

After unlocking the door, the player will be attacked by radroaches. Returning to Blake Abernathy earns the player a small reward in caps, XP, the use of the workbench, and the support of the Abernathy farm for the Minutemen.