It probably doesn’t matter which war one is fighting in, returning from or writing about. The similarities are likely stronger than the differences. Those fighting in or returning from have the advantage and the horror of personal experience. A writer with that experience may benefit or suffer from it.
The war in my current WIP is the 30 Years War, 1618 to 1648 in Europe. I make no pretense of “getting it right” but hope to know and understand at least enough for it to be realistic and evocative.
For those in a similar situation, here is one list of the best ten returning from war books.