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An English defense company has created a tank which can change it's appearance to not be seen by enemies. The idea of camouflage has been capitalized on in a field where it is highly useful, warfare. The tank uses a sweeping camera system to detect scenery behind it and then uses those images to trick onlookers that it is not there or look like another object. However it can only change its appearance in the infra-red light spectrum, not in the visible light spectrum. This kind of technology has surely been a breakthrough in anti-air military machinery for now those attacking will not be able to see anti-air units on the ground who have this technology on board. http://www.wired.co.uk/news/archive/2011-09/05/bae-invisibility-cloak