The entire SRD is available online:
http://www.d20srd.org/, and contains all of the information you need. Also, you have a week to update, so don't panic!
Of course, your post does beg the question: what made your time in the marines so brief?
During training I had a double shoulder dislocation due to an instability in my shoulders that pre-existed my enlistment; I was doing pull-ups, after a run, and I kiped at the wrong moment and my shoulders popped from my sockets. When I hit the ground they popped back in, but pinched nerves in both shoulders, which required them to be dislocated and then relocated, this time avoiding the nerves.
Lots of fun, truly, but it cut my career short, especially given the intensity of my MOS, so I opped for discharged, instead of a long period of rehab with no promise of continued enlistment.
It's all good, though, as I regreat nothing of my time in the Marines, it was what I wanted to do since I was a toddler and, even though it was brief, I enjoyed it all.
Now, back to the leveling thing; maybe I'm being blind, but while I can find the class specific stuff for leveling, I cannot find the experience chart that has the layout of when you get feats and ability score increases. Last I know, that stuff could not be included in the SRD, by rule, but if it is somewhere in there and I'm missing it, I'd love a link.
Thanks!