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Sniper". the auto biography of the most lethal sniper in u.s. military history, a book that details his 150 plus kills of insurgents from 1999 to 2009. we'll have a lot more on this developing story with a live report later on in the next hour. and there's some major developments on the growing crisis with iran to tell you about this morning. iranian official saying tehran would welcome direct talks with the u.s. coming after a response to remarks yesterday by vice-president joe biden. mr. biden said that the door is still hope for possible direct -- open for possible direct talks after a we...

Back to a missile attack that might be able to go after the helicopter. >> reporter: experts say the sound suppression technology makes distinguishable differences. first, what a standard black hawk helicopter sounds like. this has a rhythmic kind of whoosh-whoosh sound. now we'll show you what a stealth helicopter sounds like from an earlier test program. experts say this sounds a lot more vague. you may not be able to tell whether this is another vehicle entirely or a helicopter. you may not be able to tell whether the helicopter is moving towards you or moving away. >> experts say the small...