Hey how's it goin.
I'm in a similar situation as your son (got hit by a car in 8th grade while running and got a concussion amongst some other injuries) but applying to the CGA. DODMERB requested additional information (medical records etc.) and I sent them inpatient records. They then again requested post accident concussion analyzation (is that a word?) records from Methodist CrC. I'm currently in the process of providing them with records indicating that I'm far away and clear of any concussion symptoms-- and I'd encourage your son to do the same.
Basically what the DoDMERB is looking for is that your son has no lingering or permenant effects of his soccer incident. Depending on where you live, you can visit a sports concussion center and take a impact test. If your son had any testing around the time of his concussion, a higher impact score now (compared to back then) would be a very positive sign of no lingering effects. If your son didn't have any impact testing back then, a high impact score now would be great as well because it compares your scores to unconcussed healthy people in your sons age group.
Second to Last, I'd contact Mr. Mullen of DoMerb, he's a great guy who sorta speeds up the process a little bit and puts a face to the department.
lawrence.e.mullen.civ@mail.mil
Just tell him your situation and he'll take care of you.
Lastly, I just want to remind you to be careful what you send. For example an extra sheet got caught in my inpatient records from something I said when I was in the fourth grade indication a possible allergic reaction to bananas. Now, 8 years later Im going to have to have an IgE allergen test quant or semi quant for bananas.
Definitely send things fully and completely that they ask for, but just be careful what you send.
sorry I didn't really answer your question, but perhaps it's not to late to have them rescind the DQ by providing a bit of extra info.
Wishing you and your son nothing but the best in the application process
Happy holidays!