With Army ROTC, you can do both. This is the the SMP program. You would have to enlist in the National Guard, complete basic training and AIT. Then, once you successfully complete both trainings, you could contract as a cadet with an ROTC unit at a college or university that you attend. From what I have heard, contracted cadets receive monthly Drill pay for attending the ANG weekend drill, ROTC monthly stipend for being a contracted cadet, GI Bill from the enlistment contract. My recommendation is to talk to an ANG recruiter to verify my information. This is different than being a scholarship cadet. You would not have to attend AROTC Basic Camp since you have attended basic training and AIT.