Several memorial services are taking place in the Upstate Friday.
Clemson's Air Force ROTC held a special ceremony Friday morning at Clemson University.
Cadets performed a half-staff reveille at the flagpole in front of Tillman Hall.
Following the service, pershing rifles performed a 21gun salute at 8:46 a.m., the exact time the first airliner crashed into the World Trade Center on September 11, 2001.

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