I have only one but it's a special one given by a friend we met at our OU football tailgate party. Major General Geoffrey Lambert stopped by our tailgate on the way to go speak to the OU football team. We offered a beer but he declined until later, out of uniform. After the game he showed up in casual dress with his entourage. We didn't know who he was at the time other than a military person who wanted to visit with us! Long story short, we had a great time with him and how he ended up going to OU. When he was ready to leave, he shook each of our hands, and left the challenge coin I have. Later we were also invited to the Changing of the colors when he took over command of Special Forces, back in 2001. He came to a couple more games then disappeared for a couple of years. He's also written a book "The Singleton" since his retirement. This is the front:
This is the back:
