What's a "crunt"...no, wait, forget I asked...oh, too late...this is not going to end well, is it?
This is, unfortunately, a "gray-area," still. I, personally, would have no problem with individual models having Night Vision (Orca HMG Specs, Orca Driver, etc.). That said, I can see where Night Vision is supposed to a rare item (hence the cost to equip an entire squad).
I believe that the costs offset the balance issues. Therefore, unless specifically prohibited by another rule, loadouts may be taken by Support units, taking into account heirarchy, i.e., if the Support unit is a "grunt" unit (Ducal Militia HMG Team, Hussar Mortar Team, etc.), then they are limited to Grunt Loadouts. Likewise for Elites. If the Support could be considered an Individual, then they use the Individual/Officer Loadouts (i.e., all of them).