Is all gender discrimination illegal since Craig v. Boren?
No. The Supreme Court has upheld some state laws that employ gender classifications. For example, in 1981 the Court upheld a national draft law that excluded women since the government’s objective was “important” (to identify a pool of combat-eligible people) and treating men and women differently was “substantially related” to achieving that objective (the military and the Senate convinced the Court that women were generally ill-suited for combat).