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I am a cub scout den leader and at our school the pack is chartered by the elementary school. Also the school is the one who approves the chairman of the pack and also the cub scout leader. In the chain of command the chartered organization is on the top. So I would assume the that it is a school sponsored event. But I am a person that leans on caution. And I remember reading somewhere.

This is a quote from the guide for safe scouting (which is the rulebook for scouting activites)

Except for law enforcement officers required to carry firearms within their jurisdiction, firearms shall not be brought on camping, hiking, backpacking, or other Scouting activities except those specifically planned for target shooting under the supervision of a currently certified BSA or National Rifle Association firearms instructor.

http://www.scouting.org/pubs/gss/gss08.html

So that would also say no.. They can only fire you not arrest you so do what you would like. I personally carry but leave it in my car when we go hiking, camping or anything like that.