The British Ministry of Defense is cooking up a nasty surprise for enemy infantry and armor with a system it hopes will render its tanks invisible by 2012. Sounds a little shaky, but the invisible defense would employ a series of cameras and projectors to mask a tank by beaming images of the surrounding landscape onto it. So, if it works, instead of seeing a tank, you'd see the hill or house behind it. And then said hill or house would magically fire a tank shell at you.
Right now, the technology is still in development and doesn't sound too robust. But hey, the if-we're-invisible-they-can't-shoot-us defense is pretty hard to argue with, so why not work toward it?