![Historic Photograph of NSA and its Predecessor Organizations; See image description for specific information](https://media.defense.gov/2019/Mar/08/2002098169/104/78/0/190307-D-IM742-1136.JPG) | HIST-023-002 | Communications and Security; Crypto Chris posters |
![Historic Photograph of NSA and its Predecessor Organizations; See image description for specific information](https://media.defense.gov/2019/Mar/08/2002098172/104/78/0/190307-D-IM742-1137.JPG) | HIST-024-004 | Lieutenant Sprouls and Lieutenant Moon; Basic Analysis Editing |
![Historic Photograph of NSA and its Predecessor Organizations; See image description for specific information](https://media.defense.gov/2019/Mar/08/2002098173/104/78/0/190307-D-IM742-1138.JPG) | HIST-024-005 | Lieutenant Sprouls and Lieutenant Moon; B-III-c-2 |
![Historic Photograph of NSA and its Predecessor Organizations; See image description for specific information](https://media.defense.gov/2019/Mar/08/2002098174/104/78/0/190307-D-IM742-1139.JPG) | HIST-025-001 | D Branch |
![Historic Photograph of NSA and its Predecessor Organizations; See image description for specific information](https://media.defense.gov/2019/Mar/08/2002098176/104/78/0/190307-D-IM742-1140.JPG) | HIST-025-002 | D Branch; Recordak Accounting by Photography |
![Historic Photograph of NSA and its Predecessor Organizations; See image description for specific information](https://media.defense.gov/2019/Mar/08/2002098178/104/78/0/190307-D-IM742-1141.JPG) | HIST-025-003 | D Branch |
![Historic Photograph of NSA and its Predecessor Organizations; See image description for specific information](https://media.defense.gov/2019/Mar/08/2002098179/104/78/0/190307-D-IM742-1142.JPG) | HIST-025-004 | D Branch |
![Historic Photograph of NSA and its Predecessor Organizations; See image description for specific information](https://media.defense.gov/2019/Mar/08/2002098180/104/78/0/190307-D-IM742-1143.JPG) | HIST-025-005 | D Branch |
![Historic Photograph of NSA and its Predecessor Organizations; See image description for specific information](https://media.defense.gov/2019/Mar/08/2002098181/104/78/0/190307-D-IM742-1144.JPG) | HIST-025-006 | D Branch |
![Historic Photograph of NSA and its Predecessor Organizations; See image description for specific information](https://media.defense.gov/2019/Mar/08/2002098182/104/78/0/190307-D-IM742-1145.JPG) | HIST-025-007 | D Branch |
![Historic Photograph of NSA and its Predecessor Organizations; See image description for specific information](https://media.defense.gov/2019/Mar/08/2002098183/104/78/0/190307-D-IM742-1146.JPG) | HIST-025-008 | D Branch |
![Historic Photograph of NSA and its Predecessor Organizations; See image description for specific information](https://media.defense.gov/2019/Mar/08/2002098184/104/78/0/190307-D-IM742-1147.JPG) | HIST-025-009 | D Branch |
![Historic Photograph of NSA and its Predecessor Organizations; See image description for specific information](https://media.defense.gov/2019/Mar/08/2002098185/104/78/0/190307-D-IM742-1148.JPG) | HIST-025-010 | D Branch |
![Historic Photograph of NSA and its Predecessor Organizations; See image description for specific information](https://media.defense.gov/2019/Mar/08/2002098187/104/78/0/190307-D-IM742-1149.JPG) | HIST-026-001 | B III Colonel Bearce; Baudot Teletype Code on wall |
![Historic Photograph of NSA and its Predecessor Organizations; See image description for specific information](https://media.defense.gov/2019/Mar/08/2002098188/104/78/0/190307-D-IM742-1150.JPG) | HIST-026-002 | B III Colonel Bearce |