Any course approved under chapter 33 of this title, prior to
February 1, 1965, under subchapter VII of chapter 35 of this title, prior to
March 3, 1966, and not disapproved under section 3483, section 1656 (as in effect prior to
February 1, 1965), or
section 3679 of this title, shall be deemed approved for the purposes of this chapter.