I’ve copied below the USAFA website language WRT JROTC noms, right out of the nominations section (bolding mine). As I read it, your Army JROTC unit has to be an honor unit to nominate to USAFA. Of course, USAFA Admissions is your primary official source, and you can get clarity from them if your Army JROTC unit qualifies and what steps/admin are required. (Sorry, I don’t know what “HUD” means in this context, maybe “Honor,” but I’m Navy, so HUD = Heads Up Display to me).
Honor Military Schools and Air Force Reserve Officer Training Corps
There are 20 appointments total for all categories. Honor military schools are designated by the Department of the Army, Marine Corps and Navy to nominate U.S. Air Force Academy candidates annually from among their honor students. Each honor unit may nominate five students to compete for vacancies. Students should request a nomination from their senior ROTC instructor.
Members of college and high school honor Air Force Reserve Officer Training Corps (AFROTC and AFJROTC) units may also apply in this category. Five students from each detachment may be nominated to compete for the authorized vacancies. Students should request a nomination from their professor of aerospace studies or their aerospace science instructor who will then recommend nominees to the head of the institution.