Commissioning in the AF is hard if you are not an Academy or ROTC bubba. OTS is hyper selective.
Most non-Academy/ROTC USMC officer programs are moving super slow or frozen right now. There are little to no slots for USMC OCS, and the ones that are open are open to Reservists and Females.
I went to USMC OCS with an Air contract, and changed my mind on career paths after graduating OCS. I decided to pursue a civilian career in NYC while commissioning into the Reserves. My TBS date isn't until 2014 which means that things are SUPER SUPER slow right now.
Army, however, is very happy to get bodies into OCS.