Depending on where you are in the college process the PLC program with the Marine Corps is a excellent option. The latest you can start the PLC process is the fall of your junior year. They will give you a aviation guarantee upfront if you pass the testing. This assures you will go to Pensacola after completing the basic school. Once in flight school as others mentioned it comes down to your flight grades. When I went through if you were above the jet cutting score you were going jets even if you wanted helos as not enough people were meeting the jet minimum.