![Historic Photograph of NSA and its Predecessor Organizations; See image description for specific information](https://media.defense.gov/2019/Mar/08/2002098456/104/78/0/190307-D-IM742-1331.JPG) | HIST-058-005 | Spec. No. Pictures; 07/01/1947 |
![Historic Photograph of NSA and its Predecessor Organizations; See image description for specific information](https://media.defense.gov/2019/Mar/08/2002098457/104/78/0/190307-D-IM742-1332.JPG) | HIST-058-006 | Spec. No. Pictures; 07/01/1947 |
![Historic Photograph of NSA and its Predecessor Organizations; See image description for specific information](https://media.defense.gov/2019/Mar/08/2002098458/104/78/0/190307-D-IM742-1333.JPG) | HIST-058-007 | Spec. No. Pictures; 07/01/1947 |
![Historic Photograph of NSA and its Predecessor Organizations; See image description for specific information](https://media.defense.gov/2019/Mar/08/2002098459/104/78/0/190307-D-IM742-1334.JPG) | HIST-058-008 | Spec. No. Pictures; Callimahos; 07/01/1947 |
![Historic Photograph of NSA and its Predecessor Organizations; See image description for specific information](https://media.defense.gov/2019/Mar/08/2002098460/104/78/0/190307-D-IM742-1335.JPG) | HIST-058-009 | Spec. No. Pictures; Callimahos; 07/01/1947 |
![Historic Photograph of NSA and its Predecessor Organizations; See image description for specific information](https://media.defense.gov/2019/Mar/08/2002098461/104/78/0/190307-D-IM742-1336.JPG) | HIST-058-010 | Spec. No. Pictures; 07/01/1947 |
![Historic Photograph of NSA and its Predecessor Organizations; See image description for specific information](https://media.defense.gov/2019/Mar/08/2002098462/104/78/0/190307-D-IM742-1337.JPG) | HIST-058-011 | Spec. No. Pictures; 07/01/1947 |
![Historic Photograph of NSA and its Predecessor Organizations; See image description for specific information](https://media.defense.gov/2019/Mar/08/2002098463/104/78/0/190307-D-IM742-1338.JPG) | HIST-059-001 | Lab and Wing Pictures; 07/14/1947 |
![Historic Photograph of NSA and its Predecessor Organizations; See image description for specific information](https://media.defense.gov/2019/Mar/08/2002098464/104/78/0/190307-D-IM742-1339.JPG) | HIST-059-002 | Lab and Wing Pictures; 07/14/1947 |
![Historic Photograph of NSA and its Predecessor Organizations; See image description for specific information](https://media.defense.gov/2019/Mar/08/2002098465/104/78/0/190307-D-IM742-1340.JPG) | HIST-059-003 | Lab and Wing Pictures; 07/14/1947 |
![Historic Photograph of NSA and its Predecessor Organizations; See image description for specific information](https://media.defense.gov/2019/Mar/08/2002098466/104/78/0/190307-D-IM742-1341.JPG) | HIST-059-004 | Lab and Wing Pictures; 07/14/1947 |
![Historic Photograph of NSA and its Predecessor Organizations; See image description for specific information](https://media.defense.gov/2019/Mar/08/2002098467/104/78/0/190307-D-IM742-1342.JPG) | HIST-059-005 | Lab and Wing Pictures; 07/14/1947 |
![Historic Photograph of NSA and its Predecessor Organizations; See image description for specific information](https://media.defense.gov/2019/Mar/08/2002098468/104/78/0/190307-D-IM742-1343.JPG) | HIST-059-006 | Lab and Wing Pictures; SIGSALY; 07/14/1947 |
![Historic Photograph of NSA and its Predecessor Organizations; See image description for specific information](https://media.defense.gov/2019/Mar/08/2002098469/104/78/0/190307-D-IM742-1344.JPG) | HIST-060-001 | Security Division S Room; SIGABA ; 07/15/1947 |
![Historic Photograph of NSA and its Predecessor Organizations; See image description for specific information](https://media.defense.gov/2019/Mar/08/2002098470/104/78/0/190307-D-IM742-1345.JPG) | HIST-060-002 | Security Division S Room; Crypto Chris and Transfu cartoons on the wall; 07/15/1947 |