What they could've done better =====Spoilers====== =
Just taking my cue from the review who pointed out that this is one of those films where the producers seem to miss ideas and twists that are obvious to the viewer.
I think that alot more could have been made of these ghostly GI's. When they turn up they're very cheery and reassuring: bearing in mind that they later turn out to be lost souls murdered by some nameless horror, wouldn't it have been better to have them looking bedraggled and battle-weary? The discovery of their bodies is very quick and painless. Rather than showing us the corpses so that we can reach our own conclusions, the camera shows us nothing at all and it's left the the frightened troops to explain the awful discovery to us (very quickly so that we can move on to the next scene). Last of all nothing is made of the GI's promise to return with warnings of dire repercussions if their stuff has been tampered with.
Also, why do we have to have the stock long-haired-lady-ghost ending? What's she doing in this film at all? We've got all sorts of soldier-ghosts and evil spirits lurking around here which could have been used.