Have a military education exit strategy.

[vetvso]

This is all very solid advice.

Getting injuries documented while in is very important. Go to a doctor's office and tell them about everything you can think of, even if it isn't bothering you at that moment in time. They may look at you silly but injuries tend to only get worse as you age, not better so get them documented in the military and by the VA

This is very important and will be connected to possible education benefits later. My old injuries were not that bad when I first left but over time knees, back and ankles are much worse now. The hardest to get is hearing loss and if you already have some signs please get this documented ASAP. No matter what your first rating is you should consider an appeal because the system is overloaded, and they really don't want to fulfill your contractual obligations with them. It's a paper game for them and you have to play and play this hard. If something bizarre happens to go to your senator's office and ask for help from your VA representative for your congressional office. Trust me it will help and they oversee the VA's budget. 

Once you have a rating apply to the VA chap 31 vocational rehabilitation program. All of you younger vets can pull chap 31 and your New GIbill housing assistance so there is a way to use duel benefits.

If you're out already you can still take CLEP and DSST and get reimbursement from the VA using your current benefits. I'm a huge TESU fan and think the veteran office in New Jersey has done all I have ever asked.