The Post 9-11 GI Bill will only cover you if you serve in a Combat Zone. Afghanistan is the only one left, so your chances of serving a three full years (to get 100% tuition) in that theater are very slim. Plus there is lots of fine print they don't tell you about the 9-11 GI Bill.
Flight training is capped at $10,000 per year (for 100%) and most flight schools charge way more than that. I just did a Cessna Citation type rating for $17,400 and my Post 9-11 GI Bill benefits, for 21 months in Iraq were just $7000. I had to come up with the rest myself. (Type ratings are very expensive!) So, GI Bill benies for flight training aren't so great. OH, and I just remembered, you CANNOT use them to obtain your Private Pilot's License! It must be for Commercial training and beyond. So'd you have to pay for the first rating yourself. That's a lot of money, but if your'e rich, go for it. If you're not, then try to join the military.
You can become a Warrant Officer helicopter pilot in the Army without a college degree. The Army has more flight slots and more aircraft than any other branch in the military. Of course with the drawdown of forces and the Obama budget cuts that are about to come, there will be less and less slots available. That's not politics, that's the facts!
Finally, I offer this: if you go the civilian flight school route, you'll spend thousands of dollars to obtain those ratings. You'll also spend thousands renting planes that get more expensive as your ratings require more complex machines (retractable gear, turbo prop, multi-engine, instrument, turbo jet, etc.). The ATP rating will require 1500 hours before you can even apply for it. How are you going to build that flight time? It is extremely difficult to get a good job without an ATP rating and also hard to get a job without 2000 hours+. Most companies won't touch you because their insurance premiums will be too high. You might be able to get a low-paying co-pilot job in some faraway country with just your commercial and instrument ratings, but you'll be miserable for years. This is the tough nut to crack if you go civilian.
The great thing about military flight training, is that it's followed by military flight service! You can spend 5 to 10 years flying your butt off all over the world and every hour you log is one step closer to that civilian flying career you're dreaming about now. How do I know? It's what I did.