Okay, the important issue is getting overlooked here;
3 miles in 21 minutes? Running? Hmmm. Well, I look at it this way: Everytime I see someone jogging, I think to myself: "Poor guy, can't afford a bicycle", and every time I see someone riding a bike, i think to myself: "Poor guy, can't afford a car".
I'd look for a branch of the service that at least pays you enough so that you can afford a bicycle, or better yet, a car.
Take care,
~Chris