As long as the Detachment they are using has a Fortification slot, or the Formation allows for a Fortification, you can take one.
So for example, if you take the Ghosar Quintus Broodkin, you cannot take a fortification with it, as it does not allow it. If you take a CAD, with the Genestealer Cult faction, you can take a fortification, as it has a slot for one.
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