nv is badass, i want em back if i ever meet jabes again.
the way the game is setup there are only 2 barracks in NW airfield to get them from, and heli crash sites.
but since everyone serverhops the 2 barracks at NW airfield, really your only chance is heli crash sites, aka really low chance of getting them unless you find them on a dead player or like i did in a tent
go to a stupid dark server, and watch for other players with the nvg's