Contact "STARS" EMS in Calgary, Alberta, Canada...They have been certified to use NVG's for a year or so now on their Bk117's and have set the standard in North America for civillian NVG operations. They are also now approved to use them in the mountains..Miles Mozel is the Chief Pilot...
FAA approved Part 135 NVG operations started in 1999. There are a large number of NVG operators in the US and I hardly think that STARS has set the standard for North America. Maybe Canada?
If anyone is serious about the application and regulatory approvals for this type of operation, they will not go far wrong in talking to
Aviation Specialties Unlimited.