Retired Gunnery Sgt. Jack Coughlin was one of the top U.S. Marine Corps snipers in Iraq and has written a book about his experiences -- "Shooter: The Autobiography of the Top-Ranked Marine Sniper."
"I have over 60 kills," he told CNN's Gary Tuchman. "We seek out the enemy and eliminate them with precision fire."
Tuchman used Coughlin's critical eye to analyze the Islamic Army of Iraq video.
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