An official website of the United States government
Here's how you know
Official websites use .gov
A
.gov
website belongs to an official government organization in the United States.
Secure .gov websites use HTTPS
A
lock (
lock
)
or
https://
means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites.
Skip to main content (Press Enter).
Toggle navigation
National Security Agency/Central Security Service
NSA/CSS
Search
Search NSA:
Search
Search NSA:
Search
About
Leadership
Mission & Combat Support
Cybersecurity
Signals Intelligence
Central Security Service
Locations
Research
Cybersecurity Collaboration Center
Collaborative Partnerships
Enduring Security Framework
DIB Cybersecurity Services
Standards and Certifications
Artificial Intelligence Security Center
Press Room
Press Releases & Statements
News & Highlights
Podcast
Declassification & Transparency Initiatives
Cybersecurity Advisories & Guidance
Telework and Mobile Security Guidance
DoD Microelectronics Guidance
Research Publications
Careers
History
National Cryptologic Museum
Cryptologic History
National Cryptologic Memorial
Search
Search
Upload Date
Upload Date
Document Date
Title
Share
CORRESPONDENCE TO HEINTZELMANN FROM YARDLEY, 11 JULY 1922
Herbert O. Yardley Document Collection
Download Image:
Full Size (3.06 MB)
Tags:
Yardley
,
6647240
Photo by:
NSA |
VIRIN:
DDD-190906-268-030.PDF
Photo Gallery