One characteristic is the use of multiple perspectives. Instead of just focusing on the heroes, they might also show the experiences of civilians, nurses, or even the enemy. This gives a more comprehensive view of war. They may also incorporate modern themes like the psychological impact of war, such as PTSD, which was not often explored in older war novels.
New war novels tend to be more realistic in their depiction of the horrors of war. They don't shy away from showing the bloodshed, destruction, and chaos. They also often question the purpose and meaning of war in a more in - depth way. Some new war novels might be set in more contemporary or recent conflicts, bringing a sense of immediacy and relevance to the readers.