Related Clues:

• Govt. intelligence org.
• Hush-hush govt. group
• Hush-hush org.
• Secretive org.
• Hush-hush D.C. org.
• Letters at Camp Lejeune
• Eavesdropping org.
• Gomer Pyle's grp.
• Secrets keeper: Abbr.
• Code-breaking org.
• Code-breaking govt. group
• Mil. branch
• Military inits.
• Intelligence grp. established by Truman
• Govt. org. that employs mathematicians