They took the idea from a real technology which allows you to use paper thin Natural Light LCD or LED LCD screens. The American Army was trialing the technology for a while, putting many camera on all sides of the tanks, and then putting screens on all sides as well. This would make the allusion from a distance or from air that the tank doesn't actually exist. Each camera would project what was on the other side of where the Camera would be.
But I never saw it go anywhere, Probably still testing or just never got onto any news after that.
I also heard of another technology which the American army would like to start deploying soon which will allow troops to wear body armor which was about 1 mm thin, which uses a liquid/cloth material which becomes incredibly hard when a fast object hits it. But is very easily worn when walking or running normally.
Sound good hey :)