A spokeswoman for the park, whose rides include the Nitro and Runaway Mine Train roller coasters, said it didn't realize Alejandro's shirt was related to a military charity, The Reconnaissance Foundation.
"Six Flags takes great pride in the various ways we honor, celebrate and support our military heroes," spokeswoman Kristin B. Siebeneicher said by email Monday.
http://www.foxnews.com/us/2014/08/18/new-jersey-vet-denied-entry-over-military-shirt-gets-apology-from-six-flags/?intcmp=latestnews
It's seems that the mere image of a gun is offensive to some. At some point, they need to get a grip on reality. Hard to do at a theme park, but I think if there was a Boycott of Six Flags over this, I think they would be a little nicer than an email a few days later after the gentleman has to go on Fox News.