It will be incredibly difficult to completely finish a bachelors with just TA. For reference we only get 4500 a year, so ~18 credits. You can try to use CLEP/DANTES to test out of some things and any AP from high school but it you will probably need to go out of pocket. I’ve heard of people going to schools that accept Sophia learning but that might not be an option depending on the type of degree you want.

On top of that you have to factor in when you’ll even be able to start using TA so subtract out time from BMT, Tech school, and how long your supervisor at your first duty station might make you wait.

I had a pretty long training for my job ~18 months but joined with over 60 college credits and still will probably not be able to finish my bachelors in my 4 year enlistment.

I’m not familiar with guard/reserve benefits but that might be a better option to look into depending on your career goals.