They are very good at what they do. They are intensively trained to do that job and have little idea of anything else. They are trained to believe in themselves and their team - so they tend to be a touch arrogant. They live and work in a pretty closed environment so their ideas of the world seem to be somewhat 'filtered'.
When they interact with GA all that tends to come through - add to that the general incompetence that often seems to accompany the armed services and it can be quite amusing.
We had a liason visit from the local top brass after over a years worth of complaining about them busting through our circuit. As they were leaving - after promising it would never happen again - a flight of Hawks (4 aircraft) flew up the runway at about 300 feet. If seems as they get older they learn how to be embarassed!