![](https://www.historynet.com/wp-content/uploads/2020/03/purple-hed-scaled.jpg)
William F. Friedman, here in 1927. ((George C. Marshall Foundation/Photo illustration by Brian Walker))
(George C. Marshall Foundation/Photo illustration by Brian Walker)
William F. Friedman, here in 1927. ((George C. Marshall Foundation/Photo illustration by Brian Walker))
(George C. Marshall Foundation/Photo illustration by Brian Walker)