Invisible Tanks?

No, this isn't just an attempt to get you to say "tanks" (though I would feel obliged to follow up accordingly, for those who know what I'm talking about). This is for real...I think.

Some reports indicate that the U.S. Army are working on a kind of cloaking technology, rendering their vehicles virtually invisible, as in not visible to the naked eye. It gets even more sci-fi: this technology reportedly could involve "an artificial type of matter called metamaterials" that "guide light around an object, rather than refract or reflect the light".

Wow.

Imagine planes, bombs, tanks, even soldiers (and their shadows!) becoming no longer visible. I like watching it in movies, but for some reason the idea of this existing in reality makes me very, very nervous.