Can adults discretely wear a pin on their uniform to show affiliation with another federally chartered organization such as for example the American Red Cross?

Although it's a nice idea, I believe the rules are similar to military personnel wearing scouting awards (like Eagle) on their uniform, and the answer would be no. But the best place to get the information would be the Scouting Guide to Insignia, available through the Scout catalog, or your nearest Scout shop.

My best recollection is that only awards, ranks, badges, etc. given by the scouts are to be worn on uniforms. As jmcquillan suggests, look it up in the Insignia Guide. I would not rely on the casual advice of others on questions of insignia and the proper wearing thereof. A lot folks who are otherwise very good scouters are very sloppy and "out of compliance" when it comes to insignia.

Thanks to both of you. I have looked in one publication (den leaders) and found nothing that says you can or that there is an area on the uniform where pins from other organizations is permissable. I'll check the Scouting Guide to Insignia when I get a chance.