Unfortunately no. There was an officer in my squadron that got into a law school program. He recieved full active duty pay and benefits plus a full scholarship to law school. No such program exists for any seminary, rabbinical or otherwise. Separation of church and state makes it problematic for the military to pay for religious schools. There are some scholarships available from various sourses. The military has a scholarship for around $3000 per year, there’s a scholarship available for JTS (conservative) students for $15,000 per year, and I know the Army Reserve has some decent money available for people who want to be chaplains in the Army Reserve but I’m guessing you don’t want that. Bottom line, if you want to go to Rabbinical school you’ll need to get some kind of educational delay after commissioning to do so and then find a way to pay for it either through scholarships or whatever. There is an Air Force Reserve chaplain, Chaplain Roffman, who did just that. He went to MIT on a ROTC scholarship and then decided to become a chaplain. He was granted a delay to go to school and then come back into the Air Force. Talk to Rabbi Robinson at the JWB and speak to your CO, they can give you all the info you need to make a good decision.
Mike