Real-life "cloaking device"
FYI,
Inventor plans 'invisible walls'
The inventor of an "invisibility" cloak has said that his next project will be to develop the technology to allow people to see through walls.
http://news.bbc.co.uk/2/hi/technology/3791795.stm
Now imagine that technology applied to troops, tanks, planes & ships, and one has a formidable stealth army.
Isn't there a legend of the US Navy experimenting w/ making ships invisible back in WWII and the result was the Philadelphia Experiment?