Is this a ban on anyone expressing a different gender role with no associated hormones or medications?
Or is it a ban on anyone who has significant health and medication needs?
Because if it’s the latter it is justified. There are strict conditions of health to be met for the US military - a waiver can’t be created for anyone because they’re trans. The rules should apply equally to all.
If x degree of medication regime is required, then you're out, regardless of what it’s for.