
Stealth technology was initially developed to bypass intense Soviet defense systems.
In the late '50s U2 spy planes flew at 80,000ft (24,000m) to be out of range of anti-aircraft fire, but it then became clear that radar was not detecting them.
The success of the U-2s led to highly classified research work in the US, known as 'Stealth', to create a military aircraft that was invisible to radar.
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