Stress
Stress? What's the big deal? Jumping out of helicopters, dealing with hypothermia, the threat of drowning, terrifying waves, panicked victims who depend on you to save their lives? If you don't save them, no one will. Umm, no pressure.
Yeah, right.
There's plenty of stress with the job, more than most people will experience in a lifetime. Maybe you want to take up something relaxing to do with your shore leave. Tai chi, anyone?