Freight Dogs
Well, its kind of strange that you wanted to be a fighter jock and now are interested in being a freight dog !! I have done that flying for about seven to eifgt years and am back to Airline flying. Freight flying requires you to be able to work your timings around as all flying is primarily at night and only your copilot for company. No galley so no hot meals and no one to serve you!! The additional problem is that you are on a different clock from your family and friends so social life becomes practically nonexistant. At your age ,probably its good for experience but definitely not a long term career.
The positives are that night flying is peaceful,less turbulent and relatively less traffic (This ofcourse will depend on the routes that you do)). Having done both, I would any day opt for Airline Flying !!