I'll add this much, the AF recently reformatted their BASIC training just a few months ago back in December. First week at Lackland, they shoved a non-firing M-16 with real parts in your hands and that's for best friend until you leave. 'Warrior Week' (gah...) has been replaced with a full base-defense simulation, to replicate working in a FOB. They just leave all the recruits off in a little base in the desert with their TIs watching from a control tower, as they react to air strikes, bio-weapons, and IEDs with nothing but their new training. The simulation training had to happen, but the new weapons-focus and harsher regime is an attempt at something. Combine that with the downsizing of the Navy and AF, they're telling people to turn in their gear and leave, or switch to the Army in the Blue-to-Green program. Meanwhile, the Army has spots to fill, and they'll take a 16 on the ASVAB if you have a diploma. I didn't believe it until I heard it from a recruiter.
The evolution of the AF aside, if you're aiming for the Ranger way...A Ranger is a Ranger. Sure they have Airmen and Sailors headed through Ranger School for leadership training, a Ranger in a Ranger's unit isn't something you can somewhat pull together in another branch. As for the 18X contract...Stick to Ranger. Out of the eight hundred or so who took the 18X pipeline...A dozen or so made it, the rest are off in the 82nd Airborne Infantry. 98% washout rate, they hang the green beret over these kids' heads just to get them locked in with extra training. And these weren't lazy idiots, they all pre-qualified physically with special standards, and all had 90s-range ASVAB scores.
Finally...If the military wants to pay for college, consider it. I've worked with many enlisted who got full rides and even grad school years in various branches, known ROTC officers and scholarships cases, You really have to have a reason to turn down an officer's starting pay, which is twice an E-1's. Infantry Officer is indeed extremely selective, officers have to work harder to get high-speed than enlisted.