I joined the Marine Corps because I wanted to be a cop, but knew that as middle-class white-bread boy, I was in no way prepared for it. When I got out, they weren't hiring people of my color and gender, so I went back to school.
Pretty much the same, but I wasn't 21 yet, and the chief told me that an enlistment made the civil service people feel easier about hiring a white male in the current state of affairs. Of course, that chief retired, and things changed a lot, and the effort was to actively recruit women and minorities.
I also worked as an Auxiliary Deputy Sheriff for 4 years. It was an eye opening experience. I just put an application in for the PD in my city. I'm sure one of the questions will be "Why do you want a career in LE, and I could make an asnwer they will love, but the simple truth is that is just what I want to do.
USMC 1986-1992, USMCR 1992-1997
Auxiliary Deputy 1997-2001
Think about the darkest, scariest alley in your town.
You wouldn't go in there for a million bucks.
A cop does it every day for a lot less.
An auxiliary cop does it free.