This will become available after killing John Seed. Talk to Pastor Jerome in Fall’s End to receive this mission. He’ll ask for your help in helping to ensure a safe extraction for the a cult defector currently being protected at the Silver Lake Trailer Park.
Head to the location and kill the peggies outside. Once the area is cleared, meet up with The Resistance Leader. After talking to him, more peggies will arrive so make sure to lay down some proximity mines in front of the house the defector is in and make sure your allies are also positioned behind cover. The peggies will arrive in waves so well-placed explosives will take out several of them at the same time. Don’t hesitate to use explosives as well against cultist vehicles to eliminate them before they can even disembark.
After successfully repelling the peggy attack, enter the house and make sure to grab all the medkits, ammo, explosives, and armor lying around. Pick up the defector and you’ll have to carry him all the way to the dock nearby where a boat is waiting to extract him.
While carrying the defector, you can only use your sidearm. It’s also a better idea to hide and remain stealthy until you’re near the extraction point since the mission will fail if the defector dies. Having Boomer alongside you will help a lot since he’ll be able to tag enemies and allow you to avoid them. Once you reach the boat, drop the defector onboard then hop off the boat and defend the place until the boat speeds away with the defector. The mission will be complete afterward.
(Bug: The defector may be killed by clipping between the boat and the dock or he may even pass through the boat’s deck. If that happens, you have no choice but to reload the last checkpoint. You also need to make sure that you leave the boat as soon as you drop the body onboard to help prevent the bug from happening)