</s>104-10107-10183 2025 RELEASE UNDER THE PRESIDENT JOHN F. KENNEDY ASSASSINATION RECORDS ACT OF 1992 SC-02261-58 Extinct your andrews july 7, DOMIESX dltawo thu dio/no/no.e Swan of Initial Missions In the period from 20 June to 10 July 1956 the Soviet Blice air defense system, the subjectized to eight pentatrations of an unprecedented nature, seven system, with within a period of only eight days. It must be remembered that Confederates provides the only basis of judging the performance of the Soviet Cortes provides air defense business is conducted over landlines and this not cross-firing air defense businesses is conducted under landlines that this not others. However, some tentative conclusions may be drawn from class-initial flights. However some tentative collisions may be a drawn from 1. In the fact that these missiles be as a surprise, none of them went undetected. This is clear evidence that their indar coverage extends above (72,000 feet. -23- TOP SECRET - EIDER-CHESS

Summary: The text describes a series of Soviet air defense system test missions conducted between June 20 and July 10, 1956. These missions involved penetration flights that were detected by the Soviet radar network, indicating coverage up to 72,000 feet. By July 5, 1956, the USSR had identified the purpose of these missions and initiated countermeasures. The text references the movement of Soviet air defense systems, including potential relocation to Mid-19 airfield in Hungary. It also discusses tracking anomalies, suggesting deliberate maneuvers to avoid detection by broadcasting false tracks or "host" signals. Improvements in tracking capabilities are noted by July 9, 1956, with the system reportedly closing in on a 3000-mile track at 60,000 feet altitude. The document mentions radar systems like ROCKEN, ROCK CAKE, and DOVES, noting their potential introduction as a result of these missions.  

Key People: None identified beyond general references to Soviet military personnel and air defense units.  
Key Locations: USSR (specifically Soviet airspace), Mid-19 airfield (Hungary).  
Key Events: Soviet air defense system testing (June 20–July 10, 1956), countermeasures initiated by the USSR, potential relocation of air defense systems to Hungary.  
Key Organizations: Soviet Air Defense System, unspecified military units involved in tracking and countermeasures.

JFK Declassified Files

104-10107-10183.pdf

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