Food Processing Plant. When you first enter the courtyard area (when the door gets sealed behind you), proceed to the left and look at the building opposite you in the distance. The emblem is on the side of the building.
Food Processing Plant. Inside the plant, proceed to the second floor and look over the railing where the large flag is stretched across. The emblem is on the wall above the flag.
Food Processing Plant - Slaughterhouse. Proceed down the hallway where the trap room is located (the one with the three spinning blade devices). The emblem is inside the bin in the hallway near the entrance to this room.
Food Processing Plant - Factory. Inside the part of the factory that is on fire when you reach the point where you need to turn the valve to let Moira access the area where she uses the box. When you reach this point, look along the wall near the ladder to find the emblem in the distance.
Sewers. After the cut-scene where the old man opens the gate for you, turn back the way you came and investigate the end of the tunnel where the metal bars are.
Sewers. On the high platform in the T-Section of the sewers, where the south tunnel is a dead-end and the north-tunnel leads to the exit. After you climb up onto the high platform, look across the tunnel to the platform on the other side and you will see the emblem behind the wooden crates.
Monument - Tombstone Area. The emblem is underneath the small bridge.