It's like doctors and the black humor many use to help them survive the psychological impact of what they see and what they have to do.
True enough. But he wouldn't be sitting behind a desk after being taken off active duty.
But the code is "never let them see you sweat." It's part of maintaining control in a frightening profession.
Also true. Which is why I know I could never do the job. I have a very simple nature. When I screw up (praise the Lord it's not often) I say so and don't hide it and do the best I can to rectify it. It has allowed me to acquit myself quite well in my professional life. But then, my screw ups only result in data loss...not death.