* Story Highlights
* Program likened to WWII-era Manhattan Project that developed the atomic bomb
* Author discloses the existence of secret operational capabilities in latest book
* National security advisor disputes Woodward's conclusion about the Iraq surge
WASHINGTON (CNN) -- The dramatic drop in violence in Iraq is due in large part to a secret program the U.S. military has used to kill terrorists, according to a new book by Pulitzer Prize-winning journalist Bob Woodward.
The program -- which Woodward compares to the World War II era Manhattan Project that developed the atomic bomb -- must remain secret for now or it would "get people killed," Woodward said Monday on CNN's Larry King Live.
"It is a wonderful example of American ingenuity solving a problem in war, as we often have," Woodward said.
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