SAS and II
Like I say - NVG's are great and their routine use would make life safer but if I was flying around at night overland I wouldn't be doing it below the height of the highest obstacle on my route. That's the kind of consideration that might go out the window if we get too familiar with the NVG version of daylight.
Out of interest do you NVG specialists have a work around for NVG failure? Do you have a flight plan 'B' that revises the altitudes and/or the route if the kit fails?
G.