For the most comprehensive coverage on a VFR/NVG LOC accident, visit this site:
Board Meeting: Alaska State Troopers Helicopter Crash
Once there, read all the relevant material but, specifically, visit the 'presentations' via the hot-field on the top right of the opening page:
Presentations
The discussion on this site - including the opening message from the Acting Chairman Christopher A Hart - is the most compelling I have seen ever.
Mars