The Marine Corps used to have a program to get your pilots license before going to TBS. Some districts no longer do it (if any). The commitment for flight is 6 years for helos and 8 years for jets after you get your wings. However, no matter what service you go through, you'll have to give up some time because of the investment the U.S. Government puts into training you.
PLC offers you $300 a month during college after completion of six weeks of training or ten weeks of training if you're a junior. Plus an additional $5,200 for the school year. Also, you get the benefit of knowing that when you're commissioned you know you're going to flight school after OCS/TBS. No other service offers that in writing. I hope that helps.