Geoff takes a visit to the NSA National Cryptologic Museum to study a revolutionary new idea from the Civil War that changed battlefield tactics forever.

Host Geoff Edgers meets a private collector who shows him some amazing artifacts that came off the German submarine U-505, which was captured by the Americans at the end of WWII, including a trophy pistol that has been missing for 75 years.

Geoff meets with former helicopter pilot Lt. Col. Hugh Mills (Ret.), who was shot down 16 times over Vietnam during the course of his three tours of flying as a low level scout during the Vietnam War.

The West Point Museum stores a dangerous weapon sent to Europe during the Cold War meant to stop an invasion from the Soviets with an extremely powerful punch - the Davy Crockett recoilless rifle-delivered nuclear bomb.

At the National Museum of the Marine Corps Geoff discovers an award given to a small group of heroes who filmed a crack Marine fighting crew amidst a bloody Pacific battle. The award was an Oscar for footage shot at Tarawa.

Geoff visits the National Museum of the United States Air Force and is presented with mission-specific goggles that were issued to the airmen aboard the Bockscar for the atomic bombing of Japan.

At the National Museum of the Marine Corps Geoff discovers an award given to a small group of heroes who filmed a crack Marine fighting crew amidst a bloody Pacific battle. The award was an Oscar for footage shot at Tarawa.

The West Point Museum stores a dangerous weapon sent to Europe during the Cold War meant to stop an invasion from the Soviets with an extremely powerful punch - the Davy Crockett recoilless rifle-delivered nuclear bomb.

Geoff visits the National Museum of the United States Air Force and is presented with mission-specific goggles that were issued to the airmen aboard the Bockscar for the atomic bombing of Japan.

Geoff meets with former helicopter pilot Lt. Col. Hugh Mills (Ret.), who was shot down 16 times over Vietnam during the course of his three tours of flying as a low level scout during the Vietnam War.

With tanks and bullets intended for a different type of enemy, Marines in Iraq discover new challenges while fighting insurgents in an urban setting.

Operation Phantom Fury was meant to be a 48 hour battle but insurgents, armed with IEDs and a stockpile of grenades resist from the moment Americans set foot in Falluja.

Vastly outnumbered, Marines must cross the Perfume River under heavy fire in order to attempt to breach the ancient Citadel where thousands of NVA soldiers lie in wait.

Marines in Hue develop effective techniques on the fly for clearing out rooms and buildings.

Around the strategic village of Khe Sanh in Vietnam, US Special Forces soldiers get trapped in a bunker by a tank that is on top of them, and have to call in an artillery strike on their own position.

While scouting a battlefield in Khe Sanh, soldiers get lucky as a well-placed artillery shell refuses to explode.

Just as a 3-sided assault by the Taliban on U.S Special Forces and Afghan National Army troops begins, an Afghan soldier is wounded by an IED and is evacuated from immediate danger in an almost comedic manner.

Thirty-six U.S Special forces face a Taliban insurgence 5 times their size on their home turf. When forced into a corner, they call in Apache attack helicopters.

Because they are essentially helpless against the American tanks rolling into Baghdad, Iraqi fighter resort to suicide bombings using vehicles, which American forces pulverize with Sabot rounds.

On April 5, 2003, Rogue Battalion conduct a thunder run in Baghdad and have a tough choice to make about one of their Abrams tanks.

The biggest naval battle in history will be decided when a small group of under-armed, ill-prepared US ships find themselves in a chaotic and ferocious fight against the largest battleships ever built.

Seaman 1C Bud Comet tells his story of bracing for the impact of a Japanese torpedo that is headed straight for him and his ship. Watch to see what happened.