War film is a film genre concerned with warfare, typically about naval, air, or land battles, with combat scenes central to the drama. It has been strongly associated with the 20th century. The fateful nature of battle scenes means that war films often end with them. Themes explored include combat, survival and escape, camaraderie between soldiers, sacrifice, the futility and inhumanity of battle, the effects of war on society, and the moral and human issues raised by war. War films are often categorized by their milieu, such as the Korean War; the most popular subject is the Second World War. The stories told may be fiction, historical drama, or biographical. Critics have noted similarities between the Western and the war film. 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. Subgenres, not necessarily distinct, include anti-war, comedy, propaganda, and documentary. There are similarly subgenres of the war film in specific theatres such as the Western Desert of North Africa and the Pacific in the Second World War, Vietnam, or the Soviet-Afghan War; and films set in specific domains of war, such as the infantry, the air, at sea, in submarines or at prisoner of war camps. Genre The war film genre is not necessarily tightly defined: the American Film Institute, for example, speaks of "films to grapple with the Great War" without attempting to classify these. However, some directors and critics have offered at least tentative definitions. The director Sam Fuller defined the genre by saying that "a war film’s objective, no matter how personal or emotional, is to make a viewer feel war." John Belton identified four narrative elements of the war film within the context of Hollywood production: a) the suspension of civilian morality during times of war, b) primacy of collective goals over individual motivations, c) rivalry between men in predominantly male groups as well as marginalization and objectification of women, and d) depiction of the reintegration of veterans. The film critic Stephen Neale suggests that the genre is for the most part well defined and uncontentious, since war films are simply those about war being waged in the 20th century, with combat scenes central to the drama. However, Neale notes, films set in the American Civil War or the American Indian Wars