When I worked for the military police back in the 90s, it was a real eye opener for me - I think you just see so much sordid stuff that after a while you do become a bit jaded.
p.s. I was just the admin. clerk, not an MP!
Police work is police work whether it be in the military or out in the civilian world. I try telling younger officers who want to go to more prestigious departments that the job is the same no matter where you're at. The houses and the occupants still smell the same and a dead body is still a dead body. In some cases the increase in pay is worth it if you don't mind starting all over again. I'm 47 and a fifteen year officer with my agency. I'm starting to have a few health issues - as we all do as we get older. My agency is aware of that and is willing to work with us relatively older officers which seems to be true of many. Besides I don't have the patience to be starting all over and playing the games that new officers have to play. I'm established with my agency and (relatively) secure in my position. As long as I don't have a brain lock and start acting like a damn fool. But I understand the appeal of wanting to work for a more prestigious department. It can be very satisfying to the ego.