Obviously entertainment, but I think it would great for any kind of AR training simulation. Pilot training, fire rescue training, medical training, space mission training. In the field more robust units, or the tech can be adapted for actual use, in space helmets, pilot helmets, divers suits etc. I think the hololens itself is more of a development platform/proof of concept. IF/WHEN the technology is adopted it will be adapted to the actual equipment first responders, divers, astronauts, pilots, etc use for their day to day jobs.
