Capture the flag (Cut down 7 Soviet flags)
Masts with the flags are all around the installation. To cut down a flag, you need a knife. You only need to come close to the mast and the option to cut the rope appears. Flags have been marked C1 - C7, on the map.
You find it by the campfire in the Logging camp.
In the forest, among trees.
Climb onto the wooden structure near one of the murals (on the ground, there is a box that you can climb over). Then, run up, jump towards the flag and cling on to the ladder.
By he fence, right next to the rocks.
By the Supplies store, close to the campfire in the Communications tower camp.
On the round tank.
Above the campfire in the Copper Mill Yard camp.