The lifestyle that comes with military work is often unpredictable, and, contrary to what one might expect, mind-numbingly boring.
For servicemen that are in combat positions, the intensity that comes with living near the frontline is combined with monotonous waiting.
There is also the understimulated gambler.
This includes servicemen away from the frontline in non-combat positions, who conduct repetitive administrative work, are often away from their family and similarly have no time off.