After June 26, 1946, no person shall have authority to permit citizens of the American Republics to receive instruction at the United States Military Academy under the provisions of section
221 of this title. Any person who is receiving instruction at the United States Military Academy on June 26, 1946, under authority of section
221 of this title, may, in the discretion of the President, be permitted to continue to receive such instruction and, if so permitted, shall thereafter be deemed to be receiving instruction under the provisions of sections
4344 and
9344 of title
10.