In a way this could have been construed as a returning vet film, given that most of the film was fire and duck/run military action in the woods with the contrast bumped way up on the images presented. Not a lot else happened, and could have benefited with some originality. I also think your final plot point could have been developed or mixed in earlier.
This film really gave me a chill. Initially thinking it would be a straightforward action war short I really got a shock and felt chills down my spine as we are drawn back into the living room with someone there. It was a very convincing visual representation of a psychotic episode/bad trip. Good job.