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Government Code and Cypher School: Decrypts of Communist International (COMINTERN) Messages; oviet Comintern messages: Service 39: Moscow to and from Tito's HQ, Yugoslavia, 08/12/1943-25/07/1944. Moscow, callsigns FGL, OFN, DRW; message serial numbers rising to 100 and re-starting at 1, suggest a lot of messages not intercepted. Tito HQ, callsigns POS and PRB; Servicemment on message serial numbers. Service 39A, Moscow to and from Yugoslavia, 21/04/1942-05/12/1943. Moscow, callsigns BOS and FGL; message serial numbers suggest many messages not intercepted. Yugoslavia, callsigns POS, PKS and PRB; few messages. Note: Services 39 and 39A were on the same communications link with separate ciphers (39Aand 39B) for presumably different correspondents; 1942 Apr 21-1944 July 25; SERVICES 39 AND 39A.

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