The movie was very similar to Korean thriller movie called "R-point", a story about a group of Korean soldiers in 1970's Vietnam war. The overall settings were almost the same, made me thinking that the director was inspired from this movie a lot. (It was actually funny to see someone mentioning it feels like a movie from early 2000's, because R-point came out in 2000's.) Though the plot and atmosphere of two movies were different.
For me in general, Ghosts of War was not as sophisticate as R-point. This movie had many cheap jump scares, while R-point scared me just by its story only.... But it was interesting to see how the director restructured and raised the issue of WW2 and ISIS at the same time in the movie.
I would recommend to watch R-point first to enjoy the movie better.