5 Most Secret Military Aircraft You Don't Know
5. STEALTH BLACKHAWK
https://en.wikipedia.org/wiki/Stealth_helicopter
https://theaviationist.com/category/stealth-black-hawk/
https://goo.gl/NKauAD
http://jalopnik.com/5798199/that-downed-us-aircraft-was-a-secret-stealth-helicopter
4. BLACKSTAR
http://www.spyflight.co.uk/blackstar.htm
https://www.theregister.co.uk/2006/04/24/blackstar/
http://www.astronautix.com/b/blackstar.html
https://en.wikipedia.org/wiki/Blackst
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