“Red Star Rising” is the fifth mission in Crysis 3 and it contains one Propaganda Poster.
Mission 5 Propaganda Poster location
About 1800 meters from the main waypoint you will come to a part of the map where you should defeat Cell and Ceph soldiers.
On the left side of the map you can find a building with a small “stronghold”. Climb up to the first floor and pass by the room with a machine-gun on the window. in the next room you will find a Propaganda poster.