I mean, is that not exactly the kind of face the term brings to mind?
I pretty much figure any cop who shaves his head is a SWAT-wannabee who thinks his job is suppressing the civilians.
I was Air Force, but I spent several years working with the Army, often in the field, and did a tour with the Army in Afghanistan. I spent the rest of my career wearing helmets while flying. If I could keep hair on my head and clean in the field with the Army wearing a helmet 24/7, then there is no reason why a cop needs to shave his head.
Of course, I also think better of folks whose ears are not being swallowed by their fat...
When the neck is the same diameter as the head, you know you have a problem!