What are your job choices?
I was in for six years as well and wanted to go back in after ROTC. However things changed after I got out and I ditched that idea. Here are some tips:
1. Choose a job BEFORE you go
2. Realize that in basic training they treat everyone the same way and that after 8 weeks its nothing like that
3. They pay for college but you actually have to go. I signed up for school money but only attended 1 class. I now use the GI Bill but should've taken more classes.
4. The training you receive may not transfer to a real college depending on your job. My technical training was in aircraft maintenance, and none of the courses transferred to my current college. I am not pursuing anything aircraft related though.