Some are just adrenaline junkies.
Not all, but some. They are the guys who get the photo
inside the burning building or the death of the cop right beside them at a shootout. They are in the front lines with the troops and pissed if they are pulled back or can't move forward with them.
And some are just doing a job.
I've known some of both. May G-d walk beside them.

troll