I don't know what has changed in two years. They pulled me aside during drill practice, took me to Patten (medical on campus), and just gave me the lantern test again which actually kind of upset me because they sent me up to West Point to take it the first time when Kings Point was half an hour away. However, unlike your son, in my case they did not call my parents and they also did not need to set up an off campus medical appointment. When I came for indoc on one of the first few days they gave everyone the Ishihara card test again and I of course failed again. That test is very easy with red, green, and white lights shown two at a time and you just have to say what you see. I of course failed and being from New York they sent me up to West Point to take the remedial Farnswerth lantern test. I knew before I came that I had problem seeing colors and I could never see the numbers in the circles of that Ishihara test but the school made me take it anyway. I've been reading this forum for a long time and never really saw the need to reply but being 'color deficient' and a mid at KP I can tell you how it worked for me.

Aoc-hrr 2nd edition test