From tnvc website ( I thought the last paragraph was kind of interesting)
Exportation of Night Vision Devices includes travel. This means you cannot take a night vision device with you if you leave the country. Just so we are clear, this means it cannot be taken out of the country by plane (checked or carry-on luggage), train, boat, or automobile. Doing so is in direct violation of ITAR and, again, you will go to a Federal Penitentiary. This includes all civilian and law enforcement personnel (in short, flashing a badge will only make you less popular at the Federal Penitentiary).
On the same note, it is a violation of ITAR to allow any non-U.S. citizen to look through U.S. Gen3 night vision equipment (even on US Soil). They are also not allowed to have access to any operator’s manuals or documentation, whatsoever, pertaining to US Gen 3 Night Vision Devices. This is a little-known fact about ITAR and Night Vision Devices, but it is true. We have confirmed this with the US State Department and major Night Vision Manufacturers. At TNVC, we take great care to ensure our clients are properly informed on laws and regulations pertaining to night vision.