Marion Military (where I teach), Georgia Military, and New Mexico Military all teach courses for college credit and have Corps of Cadets. All cadets at MMI are college students while there are HS students at Georgia and NMMI. In those schools the HS are not place in positions of authority over college students. The other military schools are high schools with an additional postgraduate prep program, where you participate in their military activities. These may also have college credit agreements with local colleges. Finally, there are non military prep schools that also participate in foundation scholars.
You may want to go to
https://www.usna.com/asp-partner-schools and check out the links at each of the schools to see which ones fit you best.
If you have other questions, feel free to drop me a message.