With the ironic motto, Peace is our Profession, the Strategic Air Command was in charge of U.S. nuclear forces from 1946 to 1992. SAC was the ultimate Cold War military machine, at its height controlling thousands of nuclear weapons, planes, and missiles, and boasting over a quarter-million personnel. We travel to the Strategic Air and Space Museum, located 20 miles from SAC's old headquarters in Nebraska, and walk through the cavernous bomb bay of SAC's workhorse, the B-52 Bomber.

Examine the colorful history of the premier flight test center, and America's most important aviation facility for more than 60 years, Edwards Air Force Base in California. Every single aircraft to enter the Air Force's inventory has been put through its paces at Edwards, along with many Navy and Army aircraft as well. With unprecedented access to several forgotten and abandoned facilities on the base, we are guided by Richard Hallion, former chief historian for the US Air Force. Today, Edwards continues to push the envelope. Among the many cutting-edge projects currently being tested is the Airborne Laser, designed to focus a basketball-sized spot of intense heat that could destroy a ballistic missile.

Centcom" in Doha, Qatar represents everything a modern military command post can be with the most sophisticated military information systems--from video-conferencing to real-time frontline satellite communication. From this forward command in the heart of the Middle East, the U.S. ran the Iraq War. But command posts have not always been so technologically advanced as we see when we delve into the history of military communication--from tattooed messenger to satellite technology.

Made up of soldiers and civilians, scientists and specialists in an enormous variety of fields, the US Army Corps of Engineers was created over 200 years ago by Congressional mandate to respond, in peace and war, to the nation's engineering needs. The world's premier engineering and research and development agency, the Corps has blown up, excavated, grated, dredged, and remolded the shape of our continent as we pushed to expand the nation and harness the forces of nature!

The challenge: Move millions of soldiers and tons of cargo halfway around the world and into the thick of action. How? Use the biggest ships, the widest planes, and the strongest trucks. Today, military planners move men and equipment further and faster than ever. The United States Transportation Command, answering to the Department of Defense, runs military transport like an efficient private shipping and travel agency. From the Civil War to US Transcom, we track the development of military logistics.

A look at siege machines--a machine that converts energy into mechanical force to go over, under, or through fortified or fixed defenses too strong for conventional force. These engines range from man's first long-range missile weapon, the slingshot, to the laser cannons and satellite-destroying robots of the 21st century. All of these machines are designed to breach barriers--castle walls, entrenched troops, even outer space. When the going gets tough, the tough get siege machines.

The most priceless jewels in the arsenals of a handful of countries, some nuclear submarines carry more firepower than all the bombs dropped in history. Since the 1950s, these lethal steel sharks have been a cornerstone of U.S. defense policy. The Cold War launched an underwater race for supremacy with the Soviet Union. The result: engineering miracles, which roam 70% of the earth's surface, providing deterrence to enemies, intelligence about adversaries, and an abiding sense of dread.

Examines the history of radar, focusing on its role in the Allies' victory in WWII--from the Chain Home Network, rudimentary radar towers that ringed England's eastern coast, to the role of Boston's MIT in developing a smuggled English secret, the cavity of magnetron.