On size, depth, and cost (Score 1)

You're right, medics don't need more weight, nor restrictively-large NVGs. But these things won't get any smaller unless someone buys the Gen-1 product, and a medic operating on a Blackhawk, working at a unit Casualty Collection Point, or even BN Aid Station (if light discipline is in effect) could gain a lot from having these available to him / her. By purchasing early revision models, the Army gets better casualty care near the front lines now, and hopefully even greater gains down the road.

Additionally, from the manufacturer description of how this system works, it sounds as if may be possible for it to be adapted to the PVS-21, allaying concerns about lack of depth perception (which, as noted above is an issue of binocular - not color - vision).