You can start from a different point -like when "they" get "him" to wherever it is they are dragging him - without losing the fact that he has no memory of what happened before he was dragged from a battlefield. I think it would be more compelling to read if you started the narrative at the hospital that I assume he's being dragged to and show that he can't remember what happened by his response to the people around him and thier inevitable questions (What is your name? What unit are you from?).
Right now you are missing a lot of clarity from the writing. While you can say, well that's because he doesn't know what's happening that's not an excuse. For example, I thought this was more of caveman like setting because he's being dragged by his foot. As a result, the reference to the machine gun was jarring.
Also, who thinks of thier eyes as retinas?
There's nothing compelling me to read on. As to first person or third person, it depends on what happens. Other than the general warning that first person is a difficult POV to maintain and many people don't like it, I'm not sure anyone is qualified to answer that question based on what you've posted here.
I'd be willing to look at more if you want to try to respond to the 3rd person or 1st person question though.
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