I don’t think it’s Congress. There are statutes about state academies (46 U.S.C. 51000 et seq.). They include the use of training ships and the Navy Reserve subsidy payments, but I don’t think they include having a regiment. While this definitely looks like "“not me” finger pointing, it’s important when it comes to the ability to change a requirement.
And if we’re saying “not me” about academy requirements, there is no Coast Guard requirement that academy cadets have to pass the 3rd Mate or 3rd AE license in order to graduate for the academic degree.