Sorry about the rejection, but don't give up the ship! I do have a success story to share.
Last year my daughter didn't get accepted by the Naval Academy. She had her heart set on that option and did not complete her NROTC application so didn't have a backup plan, really. However, she got into a college but was too late to even apply to the NROTC unit as a programmer. Nonetheless, she was able to participate in the NROTC activities as a "drill and ceremonies" member. She attended all the workouts and formations, and signed up for a Naval Science class even though it wasn't required for her type of membership.
My advice to her was to take advantage of any opportunity offered, as it's always good to have additional knowledge and one can create opportunities for oneself. DD actually listened to me (!) and did just that. She competed for a university-wide leadership development program and was one of only two members of the Corps to be selected. She also volunteered for extra duties outside of her major and impressed the teaching staff so much that they offered her a paid teaching assistant position starting this second semester of her freshman year. (As a bonus, while volunteering, she learned from a visiting admiral of a distant relative who was the admiral's shipmate.)
In the meantime, she transitioned from a drill and ceremonies member to a college programmer member of the NROTC unit for the second semester. This time, she completed her NROTC application and was selected for a national scholarship on the first board she was eligible for. I would have had a little less gray hair had she done this last year, but all's well that ends well!