![Historic Photograph of NSA and its Predecessor Organizations; See image description for specific information](https://media.defense.gov/2019/Mar/08/2002098425/104/78/0/190307-D-IM742-1301.JPG) | HIST-054-001 | Exterior of A and B Bldgs.; 03/11/1947 |
![Historic Photograph of NSA and its Predecessor Organizations; See image description for specific information](https://media.defense.gov/2019/Mar/08/2002098426/104/78/0/190307-D-IM742-1302.JPG) | HIST-054-002 | Exterior of A and B Bldgs.; 03/11/1947 |
![Historic Photograph of NSA and its Predecessor Organizations; See image description for specific information](https://media.defense.gov/2019/Mar/08/2002098427/104/78/0/190307-D-IM742-1303.JPG) | HIST-055-001 | A.H. under construction (copies); 04/22/1947 |
![Historic Photograph of NSA and its Predecessor Organizations; See image description for specific information](https://media.defense.gov/2019/Mar/08/2002098428/104/78/0/190307-D-IM742-1304.JPG) | HIST-055-002 | A.H. under construction (copies); 04/22/1947 |
![Historic Photograph of NSA and its Predecessor Organizations; See image description for specific information](https://media.defense.gov/2019/Mar/08/2002098429/104/78/0/190307-D-IM742-1305.JPG) | HIST-055-003 | A.H. under construction (copies); Operations; 04/22/1947 |
![Historic Photograph of NSA and its Predecessor Organizations; See image description for specific information](https://media.defense.gov/2019/Mar/08/2002098430/104/78/0/190307-D-IM742-1306.JPG) | HIST-055-004 | A.H. under construction (copies); 04/22/1947 |
![Historic Photograph of NSA and its Predecessor Organizations; See image description for specific information](https://media.defense.gov/2019/Mar/08/2002098431/104/78/0/190307-D-IM742-1307.JPG) | HIST-055-005 | A.H. under construction (copies); 04/22/1947 |
![Historic Photograph of NSA and its Predecessor Organizations; See image description for specific information](https://media.defense.gov/2019/Mar/08/2002098432/104/78/0/190307-D-IM742-1308.JPG) | HIST-055-006 | A.H. under construction (copies); 04/22/1947 |
![Historic Photograph of NSA and its Predecessor Organizations; See image description for specific information](https://media.defense.gov/2019/Mar/08/2002098433/104/78/0/190307-D-IM742-1309.JPG) | HIST-055-007 | A.H. under construction (copies); 04/22/1947 |
![Historic Photograph of NSA and its Predecessor Organizations; See image description for specific information](https://media.defense.gov/2019/Mar/08/2002098434/104/78/0/190307-D-IM742-1310.JPG) | HIST-055-008 | A.H. under construction (copies); 04/22/1947 |
![Historic Photograph of NSA and its Predecessor Organizations; See image description for specific information](https://media.defense.gov/2019/Mar/08/2002098435/104/78/0/190307-D-IM742-1311.JPG) | HIST-055-009 | A.H. under construction (copies); 04/22/1947 |
![Historic Photograph of NSA and its Predecessor Organizations; See image description for specific information](https://media.defense.gov/2019/Mar/08/2002098436/104/78/0/190307-D-IM742-1312.JPG) | HIST-055-010 | A.H. under construction (copies); 04/22/1947 |
![Historic Photograph of NSA and its Predecessor Organizations; See image description for specific information](https://media.defense.gov/2019/Mar/08/2002098437/104/78/0/190307-D-IM742-1313.JPG) | HIST-055-011 | A.H. under construction (copies); 04/22/1947 |
![Historic Photograph of NSA and its Predecessor Organizations; See image description for specific information](https://media.defense.gov/2019/Mar/08/2002098438/104/78/0/190307-D-IM742-1314.JPG) | HIST-055-012 | A.H. under construction (copies); 04/22/1947 |
![Historic Photograph of NSA and its Predecessor Organizations; See image description for specific information](https://media.defense.gov/2019/Mar/08/2002098439/104/78/0/190307-D-IM742-1315.JPG) | HIST-055-013 | A.H. under construction (copies); 04/22/1947 |