Behind the strike that killed Osama bin Laden on May 1st was one of the U.S. military's best kept secrets: an extraordinary campaign by elite U.S. soldiers to take out thousands of Taliban and Al Qaeda fighters. A six-month investigation by FRONTLINE has gone inside the "kill/capture" program to discover new evidence of the program's impact--and its costs.

Originally produced for public television broadcast on May 10, 2011 ; remote version viewed on May 14, 2011. A FRONTLINE production with Mongoose Pictures/Quicksilver Media in association with Ch 4.