I highly doubt if the rules of engagement states don't shoot until shot at. Certainly if in an urban environment, clear identification of hostiles would be highly desirable to minimize civilian casualties.
Have you seen the videos of insurgents burying road side bombs? The U.S. military didn't wait for them to explode the IEDs before the Hellfire missile landed in their lap.
Personally, I think the Marines would shoot first and ask questions later.
OPREP
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