Being this is a firearms discussion forum, I will say that just being part of law enforcement and/or military does NOT make one an expert. I can vouch first hand for this. Although, the few people I believe to be experts were indeed part of the military and/or law enforcement.
I guess credentials and experience would really come into play here. I voted “other,” but I think I should have voted for “training.” How would you classify someone a golf expert, or an expert on modern economics? I would go with their level of education and experience first and foremost.