Hardcore Heroes

Jack Pritchard of the New York City Fire Department goes above and beyond the call of duty; ex-Marine John Keller assists hundreds of people in the aftermath of Hurricane Katrina.

U.S. Air Force pilot Joe Kittinger makes a parachute jump from the edge of space; Dr. John Stapp rides rocket sleds to test the limits of human endurance.

U.S. Army Staff Sgt. Drew Dix protects the residents of a Vietnamese city; Russian soldier Viktor Leonov defends the Soviet Arctic region against the Germans during World War II.