Baltic Sea. The ships of the navies of Poland, East Germany, the Soviet Union in joint exercises "North." Joint Headquarters of the fleets. Fighting naval artillery, submarines. Explosions in the sea. Meeting of German, Polish and Soviet sailors in Riga. The orchestra. Sailors dance with the girls, talking, singing. March Taman Division. Militarized relay. Caucasus. The soldiers of a military unit in the sponsored farm: tractor repair, help in the construction, harvesting grain, take part in competitions for the best plowman, participate in the collective celebration.