Praesidius

Unless part of an **attached** unit, this unit is not **visible** to enemy models unless they are within 12" of this unit, and it cannot be targeted by **[INDIRECT FIRE]** weapons unless the attacking model is within 12" of this unit. 
If this ability takes the form **Lone Operative X"**, unless part of an **attached** unit, this unit is not **visible** to enemy models unless they are within **X"** of this unit, and it cannot be targeted by **[INDIRECT FIRE]** weapons unless the attacking model is within **X"** of this unit.

If every model in a unit has this ability, each time a ranged attack targets that unit, that unit has the **benefit of cover** against that attack (13.08).