A declaration of intended major has been a part of the CGA application for many years...10+ years that I am personally aware of. Cadets are allowed to change majors their first year, but it comes with some strict guidelines, as the non-stem majors are capped.
As for the discussion regarding rejections and the reasoning behind it (which happen every year),
@rjb dug up an old post of mine and quoted it above. It is a puzzle, and I truly believe most people would be amazed to see the caliber of applicants that CGA considers. There are so many roles that cadets must fill, and Admissions truly considers the "whole" person, and what they bring to the table...what's their "hook". Years ago, during an Admissions Partner training, the head of admissions told us "Don't bring me all 4.0 perfect SAT candidates. We can't run this Academy if everyone sits in their room and studies." So while tangible scores are an easy comparison, the Admissions staff truly searches for those perfect puzzle pieces to make the CGA puzzle complete.
If CGA is your DD/DS's dream school, and they find they are rejected, reach out to CGA. Many re-applicants are successful.