No. He's just poor at judging intelligence, like everyone else.
If they are polite and don't raise their voice and there are no obvious deficiencies in their vocabulary or pronunciation, and they seem to be minimally informed on current events and trends, you couldn't tell an idiot from a genius. You have no ability to see their thought processes, and you've never really bothered to try to infer them.
Studies even suggest you don't know what's going on in your own brain either. This despite the fact that you are actually privy to at least some of your own thought process.
[citation needed]
The citations will probably be helpful for you to find the studies and similar ones.
My favorites:
Why did we think we dreamed in black and white?
http://www.faculty.ucr.edu/~eschwitz/SchwitzAbs/DreamB&W.htm
How well do we know our own conscious experience? The case of human echolocation.
http://www.faculty.ucr.edu/~eschwitz/SchwitzAbs/Echo.htm
edit: here's an interview - http://www.3ammagazine.com/3am/the-splintered-skeptic/
This could be selection bias at work. Perhaps you terminate conversations with less intelligent officers earlier, without realising the reason you do so. So, these less intelligent ones are forgotten, or removed from your sample because the conversation was not long enough to find strong evidence about intelligence.