A Bit of History

I came across a piece of history recently, a certificate from the U.S. War Department dated 6 August 1945 and signed by the Secretary of War Henry Stimson. Here is the text:

United States of America
War Department
Army Services Forces 
Corps of Engineers
Manhattan District

This is to Certify that
[name redacted]
has participated in work essential to the production
of the Atomic Bomb, thereby contributing to the successful conclusion of World War II. This certificate is awarded in appreciation of the effective service.

Hiroshima 11 August 1945

That's all I got today.