Well, probably the theme of heroism would be present. There are often individuals in true war stories who show extraordinary courage. Also, the theme of the futility of war could be explored. Since it's based on a true story, it might show how war often brings destruction and loss without achieving much in the long run. Additionally, the theme of loyalty, whether to one's country, comrades, or family, is likely to be a key aspect as people make choices based on their loyalties during wartime.
In 'The Edge of War Based on True Story', the theme of hope could be important. Despite the horrors of war, people might hold on to hope for peace, for the return of loved ones, or for a better future. Another theme could be the impact of politics on war. It might show how political decisions, treaties, or power struggles influenced the start, course, and end of the war. And of course, the theme of human nature would be there, as it shows how people react under extreme stress, fear, and pressure during the war.