The Navy(and AF) are also excessively paranoid(probably a poor choice of words...maybe vigilant would be better?) about previous health issues. I know a Wrestler who had asthma when he was a kid. CLEARLY didn't have it when he grew up. Prolonged his admission by about 2 months, Air Force turned him down on that alone. I don't remember what he had to do to get past it, but he was Wrestling in the State Tournament, going into OT, beating guys(ending up Wrestling at Navy). Hadn't used an inhaler I guess since he was 5-6.
So did Nate have a concussion and the Navy gave him this warning(most likely that if he got another one he MAY not be able to join) or did it actually have anything to do with the number of severity of the concussions?
I don't say this in a heartless way, but if you're going to become a Seal, the Navy is investing a LOT of money into you. They don't want to do that if you're potentially more inclined to have concussion issues or issues of any kind.