Saw this thread and had to take a look at was is going on today in the world of NVG's.
It's a bit of a trip down memory lane you see, as I graduated from US Army flight school in 1980. The Army was just in the early days of flying with goggles. They were full face goggles (a padded leather "muff" wrapped around your face like a giant pair of glasses) and they weighed quite a bit. We modified the head strap to snaps and Velcro on our flight helmets. Like I see you guys doing we had bags with weights velcro'd to the back of the helmet, and we started out just using lots of tire weights. I can't remember exactly what the whole rig weighed, but we knew that if we hit hard enough we would likely break our necks. And we were doing engine at idle full touchdown autorotations in those days. It was an absolute hoot!
The technology is so much better these days. They even get two engines now!!