During World War II, German intelligence spread its tentacles across the globe, operating throughout occupied and neutral Europe, and even as far afield as the United States.

Japanese fascination with the West culminated at the turn of the century with the foundation of an elaborate espionage network based on the need for military intelligence.

Britain's secret wartime Special Operation Executive was responsible for recruiting and training hundreds of secret agents, who were systematically dropped into Germany and Nazi-occupied Europe to fight the enemy behind the lines.

During both World Wars, Britain's counter-espionage service proved highly effective--no enemy spies operated for more than a few days, and many were "turned" to send false intelligence back home.

Britain's Secret Intelligence Service, and employer of the fictional James Bond, grew out of the need to combat Imperial German, and later Bolshevik Russian, ambitions in the early part of the 20th century.

The U.S.'s longest surviving intelligence service was created in 1882. One of U.S. Naval Intelligence's most prominent divisions is the American Photographic Interpretation Center, created in 1941 to train and support fleet photographers.

In a series reviewing espionage's role in the 20th century's major conflicts, we focus on U.S. Army Intelligence, which traces its roots to Revolutionary War hero Nathan Hale. Since then, the service served bravely in two World Wars, the Cold War, and Vietnam, culminating in electronic intelligence units, first used in the Gulf War.

From the early days of biplanes to today's spy satellites, the spies in the sky have proven an enduring component of modern warfare.

During World War II, German intelligence spread its tentacles across the globe, operating throughout occupied and neutral Europe, and even as far afield as the United States.

Japanese fascination with the West culminated at the turn of the century with the foundation of an elaborate espionage network based on the need for military intelligence.

Britain's secret wartime Special Operation Executive was responsible for recruiting and training hundreds of secret agents, who were systematically dropped into Germany and Nazi-occupied Europe to fight the enemy behind the lines.

During both World Wars, Britain's counter-espionage service proved highly effective--no enemy spies operated for more than a few days, and many were "turned" to send false intelligence back home.

Britain's Secret Intelligence Service, and employer of the fictional James Bond, grew out of the need to combat Imperial German, and later Bolshevik Russian, ambitions in the early part of the 20th century.

The U.S.'s longest surviving intelligence service was created in 1882. One of U.S. Naval Intelligence's most prominent divisions is the American Photographic Interpretation Center, created in 1941 to train and support fleet photographers.

In a series reviewing espionage's role in the 20th century's major conflicts, we focus on U.S. Army Intelligence, which traces its roots to Revolutionary War hero Nathan Hale. Since then, the service served bravely in two World Wars, the Cold War, and Vietnam, culminating in electronic intelligence units, first used in the Gulf War.

From the early days of biplanes to today's spy satellites, the spies in the sky have proven an enduring component of modern warfare.

During World War II, German intelligence spread its tentacles across the globe, operating throughout occupied and neutral Europe, and even as far afield as the United States.

Japanese fascination with the West culminated at the turn of the century with the foundation of an elaborate espionage network based on the need for military intelligence.

Britain's secret wartime Special Operation Executive was responsible for recruiting and training hundreds of secret agents, who were systematically dropped into Germany and Nazi-occupied Europe to fight the enemy behind the lines.

During both World Wars, Britain's counter-espionage service proved highly effective--no enemy spies operated for more than a few days, and many were "turned" to send false intelligence back home.

Britain's Secret Intelligence Service, and employer of the fictional James Bond, grew out of the need to combat Imperial German, and later Bolshevik Russian, ambitions in the early part of the 20th century.

The U.S.'s longest surviving intelligence service was created in 1882. One of U.S. Naval Intelligence's most prominent divisions is the American Photographic Interpretation Center, created in 1941 to train and support fleet photographers.

In a series reviewing espionage's role in the 20th century's major conflicts, we focus on U.S. Army Intelligence, which traces its roots to Revolutionary War hero Nathan Hale. Since then, the service served bravely in two World Wars, the Cold War, and Vietnam, culminating in electronic intelligence units, first used in the Gulf War.

From the early days of biplanes to today's spy satellites, the spies in the sky have proven an enduring component of modern warfare.