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Altimeter in Black Hawk helicopter may have malfunctioned before DCA mid-air collision
The National Transportation Safety Board says altimeter in the Black Hawk helicopter may have malfunctioned before the DCA ...
See inside Marine One, the soundproof presidential helicopter that can seat 14 people and deploy anti-missile defenses
With a landing zone on the White House lawn, Marine One is often the most convenient way for presidents to get from place to ...