Are you enlisting or joining a commissioning program? The standards may be different.
My daughter had surgery for her spondylolysthesis at age 12. She had her L-5 and S-1 fused. She was denied a waiver for both USAFA and AFROTC twice. She was able to participate in varsity volleyball and track for 4 years in high school and runs marathons to this day (she is 27) but was not granted a waiver. Today she works as a civilian DPT for the Navy which is her way of serving.
Can I ask you how your son received the waiver? I’m really interested and willing to try anything at this point to get accepted.
We saw a spine specialist that was a WP grad and an army surgeon as well. He examined him and wrote a letter stating that he felt he was able to perform all tasks required for Army and his injury would not be an issue. We sent that to Dod. Process takes a long time and patience is needed. Exam and letter sent was in April 2017, wasn’t cleared by Dod until August. Definitely worth the wait. Good luck to you.