Need to lose weight

Hello MFP,

I need to seriously lose weight. I'm looking to enlist in the Air Force, which I was planning on doing a year ago, but I decided to go to college first. That didn't go to well and I didn't like it, so I'm switching back to my original goal of enlisting. Problem is college had me add at least 40 pounds to what I originally weighed, 20 extra from what I lost already. So I'd love to have some motivation to get through this because I have to lose at most 100 lbs for them to consider me, though they did add in that my ASVAB scores were outstanding. So yeah, any encouraging words, especially from military/ex-military would be helpful.