I'm not sure if people will agree with this, or if this will be in a later version of the game. But the tactical glasses don't seem to do anything. I think it would be great if you weren't wearing tactical glasses, you may loose the HUD, and the cross-hairs. Which would mean that the tactical glasses gain some sort of purpose. Mines could also only show up with tactical glasses after the demo-expert has told the unit there are mines around. They could also reduce glare from the sun, but if you look at the sun without the sunglasses you would get full glare.
This may also give it a slightly more futuristic feel, even though this is only 20 years in the future, it would still be interesting considering the rate of technological change when there are already pieces of equipment that are controlled by eye movement. Like the targeting of enemies vehicles and planes in the Eurofighter typhoon.