I've flown with military guys in both seats at AWA. Vietnam F-4 guys. Academy grads, Gulf War A-10 guys, guard F-16 guys you name it. I can only think of one offhand that I didn't care to fly with, the rest were awesome. Most of the tools I've flown with(damn few) were civilian commuter guys like me.
I remember one guy in particular, Jim H, who flew F-4s in Vietnam. Here I was, just a 30 year old commuter guy, and old Jim was a prince. Treated me and everyone else like gold.
The letter writer is not worth paying any attention to. He stands out on his own, just like he would on any property.