I first applied for OCC my senior year back in 05 and i applied for all three as i was told applying for all three slots looks really good to the board..shows you want to be a Marine and not just a pilot. Well i was selected for ground and nfo, and regretfully i didn't take it as by now i would be a commissioned Marine (assuming the best). Well after rejecting the ground and nfo slot i graduated and got hired by Merrill Lynch and have been working here since. I've been very ansy and regretted not pursuing my life long dream ever since, truthfully its been haunting me. So i called the OSO in SD and asked them to revive my dead file that had been sitting there idle for the last year, i went through all the steps again, flight phys, pft, new app, new personal statement, new epsq, new referrals, EVERYTHING, and resubmitted for OCC195, once again i applied for all three slots. This time i was selected for the subsequent class 196 with a pilot slot. Moral of the long-winded story, don't give up, yes you can get selected for the next class, it definitely pays to reapply if you aren't selected the first time, and yes you can get selected for another slot if you aren't selected for your intended one. However you do sign all the paperwork and contracts for the designations your applying for so if your applying for ground, nfo, pilot thats three sets of contracts your signing... Hope this helps. Oh and if your not selected your first go around, do something productive between the first go around and reapplying...