They used to be quite popular here, not so much anymore. Where I think they make sense are places like amusement parks and such. I always wore one when I was in Laughlin Nevada (gambling town). I could stuff my cell phone and wallet and cash and chips down in front and not worry about anyone taking it.
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Pat Tillman (1976-2004):
4 years Arizona State University, graduated with high honors.
5 seasons National Football League player, Arizona Cardinals.
Forever United States Army Ranger.