With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: Apocalypse Now does not touch on themes of war.
text_B: War film is a film genre concerned with warfare , typically about naval , air , or land battles , with combat scenes central to the drama .. film genre. film genre. naval. navy. air. air force. land. army. It has been strongly associated with the 20th century .. The fateful nature of battle scenes means that war films often end with them .. war. war. Themes explored include combat , survival and escape , sacrifice , the futility and inhumanity of battle , the effects of war on society , and the moral and human issues raised by war .. war. war. War films are often categorized by their milieu , such as the Korean War ; the most popular subject is the Second World War .. Second World War. World War II. The stories told may be fiction , historical drama , or biographical .. fiction. fiction. historical drama. historical drama film. biographical. biographical. Critics have noted similarities between the Western and the war film .. war. war. Western. Western ( genre ). Nations such as China , Indonesia , Japan , and Russia have their own traditions of war film , centred on their own revolutionary wars but taking varied forms , from action and historical drama to wartime romance .. war. war. historical drama. historical drama film. Subgenres , not necessarily distinct , include anti-war , comedy , animated , propaganda , and documentary .. war. war. anti-war. anti-war film. animated. animated film. propaganda. propaganda. There are similarly subgenres of the war film in specific theatres such as the western desert -LRB- North Africa -RRB- , the Pacific in the Second World War , or Vietnam ; and films set in specific domains of war , such as the infantry , the air , at sea , in submarines , or at prisoner of war camps .. war. war. air. air force. Second World War. World War II. Vietnam. Vietnam War. in submarines. submarine films. prisoner of war. prisoner of war
related.