Radar-invisible Stealth aircraft and ships are a regular part of modern warfare. The next generations are said to blend into their environment using what's called "adaptive camouflage", making them invisible to the eye as well as radar.
The most famous invisibility tale, however, is the Philadelphia Experiment, a classic story of military experimentation gone wrong. As part of Project Rainbow, while docked at Philadelphia Navy Yard in 1943, the cannon-class destroyer USS Eldridge (DE 173) was fitted with a number of powerful generators and something called a "time zero generator". When this was switched on, the Eldridge was engulfed in a greenish haze, then, with the imprint of its hull still visible in the water, the ship disappeared from view for 20 minutes.
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