In the Marine Corps you would enlist under the AG enlistment contract.
This would put you into position to become a 6172, 6173, or 6174 Enlisted Air Crewmember.
You would attend Bootcamp, MCT, and then you would go to Pensacola for a few weeks (sorry I don't have many details on this). You would then attend school for your airframe and become a basically qualified mechanic.
You would then go to a training squadron (HMT-303 for example) and become a Plane Captain. After that, you would start getting your training X's.
Once that is complete you would go to the fleet.
Oh yeah, somewhere in there, you should wind up at SERE.