well it depends on how your going to write the story, are we watching along side the Marine or looking back at the events from his or someone else popective?
If we are watching the timeline as it unfolds then id say with a resounding yes, don't do it all but you'll have to do it.
If your looking back you wont have to as it can be done as if your looking at the important actions leading up to the main event, however saying that id still say that you'd need to attleast touch up on a few things.
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