My son was one of the apparently 14 who received a color blind waiver for the class of 2023. However, he did not receive an LOA, but did go through the Foundation program. Luckily, the waiver just transferred from 1 year to the next (phew). Originally, my son wanted to be a Navy Diver but that got squashed. He was a little bummed but continued to pursue the Academy route. Now, he is looking at Intelligence or METOC.
Signing the letter saying he must accept Marines if that's the only choice was the toughest part (not that he has anything against Marines). He had a good conversation with the recently retired Capt. Wallace (he was the head of the Foundation program) and Capt. Wallace said that yes, there is a chance you may end up Marines but, he has yet to see it happen. So, my son signed and is currently "enjoying" his Academy Plebe year.