Dedicated to those who worked in Building 26, 1942-1946

The mission of this site is to tell the story of hundreds of people who worked at the United States Naval Computing Machine Laboratory, a top secret project in Dayton during World War Two. These people kept their secret for over fifty years. They produced machines which were crucial to the war effort and helped to save the lives of tens of thousands of troops, on land and sea, around the world.

Please take a look–there are hundreds of pages of declassified documents, rosters of personnel, photographs and more. (An easy way to check this out is to visit the Sitemap page.) I have added a new bibliography page brought up to date to include burgeoning information about cryptography on the web.

This site originates with and is maintained by Debbie Anderson in Dayton, Ohio. My father was Joseph Desch, Research Director for the NCML. This site is an outgrowth of my own efforts to learn more about the story behind my father’s secret work and a desire to share what I have learned. It also is a resource for the facts behind the documentary Dayton Codebreakers.

I am grateful to the Archive Center at Dayton History, the Wenger Command Display in Pensacola, Florida, friends at the NSA Center for Cryptologic History and the National Cryptologic Museum, and the many veterans–WAVES and sailors– who have been so generous over the years for a share of the photographs presented here.

Thanks for learning about a part of Dayton’s, and the nation’s, history.

Launched 2001

A popular page on my site, The US Navy Cryptanalytic Bombe, now with new photos and a link to a bombe simulator.

Excellent update of a page at Virmuze [network of Virtual Museums] about the US Bombe with information about some components.

Watch a YouTube video from the NCM about the US Navy Cryptanalytic Bombe from the Nat’l Crypto Museum

My favorite page: The incredible amount of production at the US NCML reflected in the By the Numbers page.

Redone page of Cryptanalytic Equipment in operation at Nebraska Avenue, linked to full-size photos

NEWS

A roving correspondent sent this news announced in the Navajo Times, Phoenix, 22 Oct 2024. Here is an excerpt:

The Navajo Nation is mourning the loss of John Kinsel Sr., a revered Navajo Code Talker who passed away peacefully at the age of 107. Kinsel’s remarkable life and contributions to both his community and the United States during World War II will forever be remembered.
… Kinsel served as a Navajo Code Talker, using his knowledge of the Navajo language to create an unbreakable code that played a crucial role in securing victory for U.S. forces in the Pacific Theater during World War II. His courage and dedication helped save countless lives and contributed significantly to the military’s efforts during one of history’s darkest periods.

For some time I’ve mentioned the Puzzles and intriguing factoids the National Cryptologic Museum has been posting several times a week at their Facebook page, National Cryptologic Museum. Now the NSA (No Such Agency) has broken ground with a weekly Podcast on their web site, No Such Podcast. One episode that relates to this web site, The Women of the NSA: Codemakers and Codebreakers. Previous episodes included AI, and intelligence leading to the location of Osama bin Laden.

The Sept. 26 episode has a title that’s hard to resist: The Cutting Edge of Classified Research at NSA.