Menu
Here is a list of past presentations at ICCH. The most recent presentation is at the top. Click on each listing to reveal more information below, including the speaker, presentation description and to access recordings.
Note: Effort has been made to ensure that the information on each presentation is accurate and up-to-date. To suggest a correction please contact the ICCH webmaster Patrick Hayes at .
The On-the-Roof Gang book series is the riveting untold story of the 176 Sailors and Marines who learned the Japanese katakana telegraphic code and how to intercept Imperial Japanese Navy communications, setting in motion events that would lead to the birth of the US Navy's communications intelligence organization. Volume 1 - Prelude to War is based on the unknown true-life story of the "On-The-Roof Gang," the U.S. Navy's fledgling radio intelligence organization in the years leading up to World War II. It is based on the real life of Harry Kidder, a U.S. Navy radioman who first discovered and deciphered Japanese katakana telegraphic code while stationed in the Philippines in the 1920s, discovering that he was listening to Imperial Japanese Navy (IJN) radio communications. Kidder strongly believed in the future of radio intelligence and a chance meeting with Lieutenant Laurance Safford led to the birth of the Navy's Radio Intelligence community. Kidder taught others the nascent art of intercepting IJN communications on the roof of the Main Navy Building in Washington, DC. From 1928 to 1941, 176 Sailors and Marines attended this training and were then stationed as radio intercept operators around the Pacific. These men would become known as the On-The-Roof Gang and were charged with keeping track of the IJN as they prepared for war with the United States. The circumstances of America's entry into World War II hinged on the success or failure of the On-The-Roof Gang, and Harry Kidder knew this. On-the-Roof Gang: Prelude to War concludes with the "date which will live in infamy," December 7, 1941. Volume 2 - War in the Pacific begins with the Japanese surprise attack on Pearl Harbor and documents the contributions of the On-the-Roof Gang during World War II. It focuses on the wartime stories of the On-the-Roof Gang intercept operators, some who were stationed in Hawaii, some who survived a tortuous existence in a POW camp, others who had to evacuate their intercept sites, and still others who performed intercept operations while at sea during some of the most famous naval battles of World War II.
April 27, 2022
Here is a list of past presentations at ICCH. The most recent presentation is at the top. Click on each listing to reveal more information below, including the speaker, as well as the presentation date and description. Presentation recordings are available separately, in the ICCH Portal.
To view upcoming ICCH presentations, click here.
Note: Effort has been made to ensure that the information on each presentation is accurate and up-to-date. To suggest a correction please contact the ICCH webmaster Patrick Hayes at info@cryptologichistory.org.
The On-the-Roof Gang book series is the riveting untold story of the 176 Sailors and Marines who learned the Japanese katakana telegraphic code and how to intercept Imperial Japanese Navy communications, setting in motion events that would lead to the birth of the US Navy's communications intelligence organization. Volume 1 - Prelude to War is based on the unknown true-life story of the "On-The-Roof Gang," the U.S. Navy's fledgling radio intelligence organization in the years leading up to World War II. It is based on the real life of Harry Kidder, a U.S. Navy radioman who first discovered and deciphered Japanese katakana telegraphic code while stationed in the Philippines in the 1920s, discovering that he was listening to Imperial Japanese Navy (IJN) radio communications. Kidder strongly believed in the future of radio intelligence and a chance meeting with Lieutenant Laurance Safford led to the birth of the Navy's Radio Intelligence community. Kidder taught others the nascent art of intercepting IJN communications on the roof of the Main Navy Building in Washington, DC. From 1928 to 1941, 176 Sailors and Marines attended this training and were then stationed as radio intercept operators around the Pacific. These men would become known as the On-The-Roof Gang and were charged with keeping track of the IJN as they prepared for war with the United States. The circumstances of America's entry into World War II hinged on the success or failure of the On-The-Roof Gang, and Harry Kidder knew this. On-the-Roof Gang: Prelude to War concludes with the "date which will live in infamy," December 7, 1941. Volume 2 - War in the Pacific begins with the Japanese surprise attack on Pearl Harbor and documents the contributions of the On-the-Roof Gang during World War II. It focuses on the wartime stories of the On-the-Roof Gang intercept operators, some who were stationed in Hawaii, some who survived a tortuous existence in a POW camp, others who had to evacuate their intercept sites, and still others who performed intercept operations while at sea during some of the most famous naval battles of World War II.
April 27, 2022
