You see the lifeless body of a fallen Marine a couple of feet away with a rifle that lays beside his body. From the looks of it, it's a Mauser 98K which would be perfect to take back.

You crawl over to the rifle and grab a hold of it. Just as you grab a hold of the rifle and stand in your accomplishment of you had retrieved you are shot by a Japanese soldier convinced you are a Marine carrying a rifle. Your body now joins the unfortunate loss souls of this tragic war.