If you have a degree, you would be an idiot NOT to commision.
If you want a "laborous" job then lean towards the Marine Corps. Officers still typically do less dirty work than enlisted, but I've seen some hard working officers(also seen a fair share of dirtbags).
I always tell people to enlist in the AF unless they want to be miserable for 4-5 years, then go MC. Those are the only two branches I would even consider. Not to offend as we are all one big family.