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Optical. Aside from what we know about camouflage, the most promising optical stealth technology is that dealing with the elimination of contrast by
the use of lighting. In the latter stages of the Vietnam War, serious efforts were made to enhance the combat effectiveness of U.S. tactical aircraft
through the medium of optical stealth. The classic example was a ground test conducted at Miramar, California, in which a Phantom II was configured
with a series of strategically located white lights. The test showed rather dramatically that when contrast is reduced, so is the optical signature.
For a number of reasons, follow-up tests to this initial development effort were never pursued; however, the results of tests conducted a few years
ago showed great promise. The drawback of optical stealth is the same proximity problem that faces the magnetic detectors.
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