You can apply for every service ROTC scholarship, but before you do, ask yourself if you are willing to serve 4 years active duty upon graduating.
Also investigate how each scholarship varies.
For example:
AFROTC scholarship is more like a 2 +2 scholarship. You must be selected for field training in the spring of your sophomore year. If not selected they can and probably will disenroll you, which means if you need the scholarship to pay for school, you can be SOL the last two years of college.
~ last years selection rate was @60%. However, if you don't want to go rated, and are a CJ major, I believe that rate was @30% or even lower. I can't recall for sure, but that is sticking in my mind.
AFROTC does not care what school you choose, unless you are offered a type 7. In that case if the school agrees to charge you IS tuition, they again don't care. The scholarship is tied to the cadet, not the school like AROTC
AFROTC cares a lot about your intended major. 80% + of all scholarships go to Tech majors
AFROTC selection uses best sitting. They do not super score. The median ACT for a type 7 is over 29, and a type 1 it is @31.
If I was to be brutally honest, between the criminal justice major and the 3.0 cgpa, unless that ACT is over 30, your chances are not very high unless you have some type of hook. As I said earlier AFROTC does not tie the scholarship to the college, just the cadet. Thus, they couldn't care if one college has 100% on scholarship and another has 0%. It is a national board, highest whole candidate score (WCS) wins the scholarship. AROTC and NROTC OTOH ties the scholarship to the cadet and the college.
The overall selection rate is @18% of those boarded for AFROTC.
You have 0% chance if you don't apply, so you should apply.
For AFROTC the interview will not occur until your packet is completed, including the PFA. It is a step process. Complete the packet, than they decide if you are competitive enough to go onto the next step. AFROTC will state a 24E is typically considered non competitive to become a candidate. At that point you will have an interview. You than will be what is called boarded. If selected than the next step is the DoDMERB.
If my memory serves me correctly, but I may be confusing it with the SA packet. The GC will go online and submit it electronically. You will never see what they submitted. It will be questions regarding your class rank, your course rigor (how many APs you took compared to how many are offered compared to your peers) they also will look at the school profile. How many go to Ivy, how many got to 4 year, CC or work force. They do this because a 3.0 at your HS may seem low, but if your class rank is 10% and 25% go Ivy, than it tells them the school is rigorous and do not hand out As like candy on Halloween