The best way is to do the AFguard or reserves if you can... then active af, but I don't believe there is a way to get a garaunteed pilot slot. If you do go USMC and do end up in helos, you can do your 20years, then your retirement plus a regional job isn't horrible, and that is assuming you don't do an instructor tour and get your fixed wing time. I'm ex active duty AF and I taught at Vance afb, which we have Marine and Navy instructors and students. I know 2 ex marines who used their 2000 T-37 hours to get on with Southwest, and now are in the Air Force reserves at Vance still teaching T-37s.