Baltic Sea. Ships of the Navy of Poland, East Germany, USSR at the joint exercises "North". Joint headquarters of the fleets. Combat operations of naval artillery, submarines. Explosions at sea. Meeting of German, Polish and Soviet sailors in the city of Riga. The orchestra is playing. Sailors dance with girls, talk, sing. Forward march of the Taman division. Paramilitary relay race. Caucasus. Soldiers of one of the military units in a sponsored collective farm: repairing a tractor, helping with construction, harvesting grain, taking part in competitions for the title of the best plowman, participating in a collective farm holiday.