U.S. Intelligence on Europe, 1945-1995

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• SIGINT x
• 1 9539 TSU
• 1 Aerial reconnaissance
• 1 Airborne radar
• 1 Allen Dulles
• 3 Army Security Agency
• 2 Berlin crisis
• 2 Berlin Tunnel
• 2 Berlin tunnel operation
• 1 Coded messages
• 2 Construction
• 1 Cover story
• 1 Curtailment or elimination
• 1 Czech Military Mission
• 1 East German shift to microwave communications
• 1 East Germany
• 1 Electronic emissions
• 1 Electronics
• 1 ELINT
• 1 Field Station Berlin
• 8 Germany
• 2 HUMINT
• 2 Intelligence activities
• 1 Intelligence facilities
• 1 Intelligence missions
• 1 Interrogation of refugees
• 1 Interviewing refugees
• 2 Khrushchev
• 3 Listening posts
• 1 Military surveillance in East Berlin
• 1 Morse intercept
• 1 Negotiable
• 1 Patrolling
• 1 Paul
• 1 Personnel
• 1 Personnel strength
• 1 Pincus
• 2 Secret source
• 1 Security matters
• 1 Security measures
• 1 Site survey
• 1 Site surveys
• 2 Soviet contingency planning
• 2 Soviet military
• 1 Symington
• 3 Telephone tapping
• 1 Tunneling
• 1 U.S. Intelligence Board
• 2 Underground communications cables
• 1 USIB
• 2 War preparations
• 1 William Harvey