Explores how the US Marine Raiders helped destroy the Japanese hold on the ground and paved the way for an Allied victory in the Pacific.

The American tank crews fight against the Nazi Panther tanks in explosive duels to the death during World War II.

Zookeepers who handle the dangerous African elephants; a man extracts snake venom for medical research; 13 carnivores; alligators.

The commando unit known as the First Special Service Force executed combat and reconnaissance operations behind enemy lines during World War II.

Accounts of people who gathered information on enemy positions during battle, including John Fox and Brian Thacker.

Detecting and neutralizing landmines carries a high price.

The U.S. Navy's deep sea divers experiment with extremes of depth and time.

The Bureau of Alcohol, Tobacco and Firearms is charged with enforcing some of the most politically volatile laws in U.S. history.

Infantry soldiers whose job it was to search for, find and destroy a subterranean network of enemy tunnels in Vietnam.

Courageous linemen erect, string, and repair electrical transmission towers that can carry up to 765,000 volts.

Operating in the covert Studies and Observations Group, volunteers from elite U.S. units combined their talents to hit enemy strong points during the Vietnam War.

The pioneering lumbermen of the 19th and 20th centuries tame the wilderness across the continent, making the building of the nation possible.

Snipers, the most feared and hated men on the battlefield, have the ability to kill with a single shot from miles away.

Discovering how the Pathfinders factored into D-Day and other battles of World War II, including North Africa and the Battle of the Bulge.

Fighter pilots destroy enemy radar and missile sites.

Soldiers train to join the ranks of America's elite commando force.

An exploration of the dangers involved for the airmen who manned the B-17's belly guns during World War II.

Tracing the history of U.S. military police from George Washington's army to today's missions defending justice in war and peace.

The international community organizes special teams designed to confront and defeat terrorists on any playing field.

Ironworkers tread narrow beams hundreds of feet aloft to raise skyscrapers and bridges.

Storm chasers travel into the eye of a hurricane and tail along with a raging tornado for research and thrills.

Mining was once the most dangerous profession.

World War II German submarines held a stranglehold on Allied shipping in the Atlantic until the development of sonar.

Combat medics perform one of the most dangerous jobs in war.

Long-haul truckers drive rigs over hundreds of miles of frozen Canadian lakes.

The Rescue Swimmers of the U.S. Coast Guard and Navy save people from raging waters.

Army Rangers use quick-strike tactics and an unshakable esprit de corps to brave withering fire and seize vital targets.

Specially trained soldiers and sailors are given secret, dangerous missions at the vanguard of the D-Day assault.