To start this mission, you should enter the Army Warehouses level. From there, you can see a trio of Freedomers, who will be killed by a neutral Duty squad. Keep going until you see a farmstead on the right-hand side; go there, and you will see the commander, Skull. Keep going on the road until you reach a Freedom checkpoint, then turn right and go into the base and keep going. After the tank there is a broken statue and a building with guards; talk to the one by the entrance and ask him to let you in, then go upstairs. On your left-hand side is a room with a stalker called Lukash. From there you can officially start the mission. He will tell you to go speak to Max, so go downstairs, out of the building and back to the tank, left, then you will find a group of Freedomers resting by a fire