There are quite a few videos that show what it is that the Patriot Guard Riders do.  I did a search on Youtube and found some that I recommend.

http://www.youtube.com/watch?v=AupyzbQMLAs

http://www.youtube.com/watch?v=ZwigMTjup70

http://www.youtube.com/watch?v=wJ2QY_1sXCI

http://www.youtube.com/watch?v=FWhpA9MrkPw

http://www.youtube.com/watch?v=G10T_Ih222E

http://www.youtube.com/watch?v=pnp9idOEj4g

You can see all of the videos by searching:

http://www.youtube.com/results?search_query=patriot+guard&search=Search

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