For drones, I interpret this as a "no". https://www.nps.gov/articles/unmanned-aircraft-in-the-national-parks.htm As for metal detecting, it is illegal to use metal detectors and/or remove anything from a national park. https://www.nps.gov/fosm/learn/management/metal-detecting.htm
Yes on the drone, not inside the fort though. Cannot dig or take items found
No
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