Night turn direct fire modifiers when visibility is 2 hexes.

[Brett Nicholson]

I was hoping someone could clear up whether the -1 direct fire modifier is in effect during night turns when visibilty is 2 hexes instead of 1 hex. In 'Desert Rats' almost every night scenario, except for #6-Night Flight and #25 -Ngati Tumatauen-ga (where visibility is not specified), the night visibilty range is 2. Is this to be left to player discretion or is there an official ruling on this? On the Direct fire table it states: -1 night (visibility one hex).