It was pointed out before, but I think it bears repeating. Your props, costumes, makeup and location selection were fantastic. Also, I agree that the music choices really worked for the film.
Others have already commented on the special effects, which need some work, so no need to elaborate on that.
In terms of the editing, I think you could recut this to improve it quite a bit. For example, fairly early on around the 2:00 mark, you have the entire patrol coming around this one corner of a building. You shot the entire group turning the same corner from the same static camera position with no breaks. By the time they were done I thought I was watching a Benny Hill or Monty Python sketch. I was thinking, "Man! Just go around the darned corner already!"
I think that could have been shortened a good bit, possibly broken up at least with a few different camera angles of some of the soldiers sneaking around from closer up, or below, or something. And I don't think you needed to show every single one of them turning the corner to move the story forward.
Exact same problem with them in the next scene coming out of the field and onto the road. That dragged on forever and I was losing patience by that time.
Camerawork.. mostly pretty great, but I did notice during that "final charge" near the end of the movie where you had the backwards running shot keeping up with the advancing soldiers, it shook the camera enough that the picture just deteriorated.
We never got to see even a hint of the enemy that the squad was fighting. Not so much as a wisp, as far as I could tell. You had a lot of actors at your disposal for this film. You might consider putting at least a few in a different uniform to be fighting back. Or failing that, maybe at least lay in some muzzle flash from the treeline as the squad is approaching. We saw some of the good guys getting hit and going down, but no clue as to who was shooting them or from where.
And last, while I can see how somebody might choose to go this route for an artistic feel, I was put off by the complete lack of dialogue in the film. You didn't need a ton, but just something to flesh out the story and give us a sense of who the good guys were, what the mission was, why they were there fighting that particular battle... something. Without some sort of context for the plot, it felt rather random.
Anyway, just some observations from me. I still gave you a 3 just for the setting, costumes, music, and all the effort that must have gone into it. With some rework in post I think you could still have a pretty impressive film.