| It's very easy to say "why haven't they secured the crash site". However, the crash site is well within rebel held territory so it's not just a matter of "showing up". First they would have to get to the site, fighting along the way, and then once they secured the site they would have to protect a rather long supply line - people and supplies would have to be transported to and from the crash site, and that supply line would be long and would need to be secured and protected.... 
 So it's not a matter of securing twenty square miles, but also a sixty to one hundred mile long supply line.
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