I agree with Agagles and kinnem regarding what major do you think you can graduate with only 2 semesters left.
I would also think from an ADAF manpower needs perspective they already have you slated to go into Nursing.
Manpower needs are set not only by yr group, but AFSCs too. Thus, even if you could graduate in a yr., they may say that they are over manned and dis-enroll you. You could land up owing your scholarship back.
You took a scholarship promising to serve in a specific career field, like the ABM/CSO scholarship. You would be in default and that would allow them to say good bye even if you could graduate in time.
Currently, there are 2 threads regarding dis-enrollment. One on here that involves AROTC and NROTC, one on AFA regarding an AFA cadet. All 3 will not be serving as enlisted, they will be paying a hefty chunk of change for at least 4 yrs and up to 10 yrs with interest. Don't assume this is just about losing your scholarship for the last yr., but more so about paying back the 3 yrs they paid for and dis-enrolling you from AFROTC.
I would think very long and hard about this decision. I would sit down with your adviser. Ask them the likelihood in this current environment that they will keep you. Also start looking into career fields because if they do, your AFSC board will be meeting very shortly after you return to school next fall.