Some Strategy cards (like Observation Post) give one or both players the ability to place observation post tokens. These tokens allow the owning player to trace LOS as if a fresh friendly officer were in the hex. This LOS may only be used for mortars and off-board artillery attacks.
Observation post tokens may only he placed in a building or collapsed building hex/overlay that is not occupied by the enemy. Observation post tokens may also be granted by scenario special rules.
[f an enemy unit enters the hex. the observation post token is immediately removed.