The ROTC program is great if you want to have to take extra classes that have nothing to do with aviation. You could end up not getting into AF flight school, then what? The marines don't have a ROTC program which means no extra classes no having to wear BDU's to school, keep your hair how you want it. All this and a spot is reserved for you after you graduate, no guessing, no reassignments, no deploying. Oh and you don't have to compete for a scholarship with other people. If you have fabulous grades go the AF way(more perks, easier basic) but for the aveage joe, marines is the way to go.