so they can see through willie petes from the looks of it. thermals that have the ability to be able to see through some very heavy smoke grenade or whatever? white phosphorous - willie petes - M34 type stuff. not sure of all the white phosphorous smoke grenades out there alone. M15 - WP (White Power) smoke grenade. Just kidding white phosphorous (not white power). http://www.operationalmedicine.org/Safety/Weapons/Images/Grenades/M15%20WP%20Smoke%20Grenade.gif Smoke grenades are one of my favorite things since they allow for escapes and they are non-lethal for the most part (not sure if any one has died from one - not talking about getting hit either - since something else could do that to that is a hard object as well). One of the reasons I always liked smoke grenades the best. --- wonder if it's a night vision thermal system then or something like that. --- create smoke walls and such for escaping in a dangerous situation alone (self defense situation). --- M18 from Tom Clancy's Rainbow Six Siege http://vignette2.wikia.nocookie.net/rainbowsix/images/2/2f/Smoke-grenade-image.jpg/revision/latest?cb=20151210203236 --- always wanted smoke grenades for home self defense. I always figured you could just get smoke bombs to as well in a self defense situation as well (DIY - self defense - get away). or something like these - smoke grenades. I almost should have these for around the home. Would be intruder would be confused if I threw a couple alone inside. https://www.ansgear.com/EG18X_Smoke_Grenades_s/6377.htm https://www.sportsmoke.com/ "battlefield grenade" alone - 70,000 cft - smoke anyone out the best I could at that point. https://www.hustlepaintball.com/Smoke-Grenades-s/207.htm