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- Org. chronicled in 'The Puzzle Palace'
- D.O.D. division
- Govt. intel group
- Org. with an annual Codebreaker Challenge
- It checks for leaks, for short
- Intel-collecting org
- Document to keep co. secrets
- Org. based in Fort Meade, Md
- Leak-plugging government org. headquartered in Ft. Meade
- Its MD museum displays an Enigma machine
- "The Puzzle Palace" org
- Intel-gathering govt. group
- Intelligence org. formed under Truman
- 'Snowden' org
- Subj. of the 2017 memoir 'Working on the Dark Side of the Moon'