In carrying out this part, the President is authorized to provide for attendance of foreign military personnel at professional military education institutions in the United States (other than service academies) without charge, and without charge to funds available to carry out this part (notwithstanding section
2392
(d) of this title), if such attendance is pursuant to an agreement providing for the exchange of students on a one-for-one, reciprocal basis each fiscal year between those United States professional military education institutions and comparable institutions of foreign countries and international organizations.