; (iv) shall be subject to, and shall comply with the authority of, the Commander of the United States military installation at which he or she is stationed for training, who shall be responsible for the continual monitoring and control of the alien; and (v) shall remain in good standing in the military training program to which he or she was accepted, as determined by attendance, participation, and the performance metrics specific to such program. (4) Reimbursement for vetting and monitoring costs Costs incurred by the United States Government that are directly associated with the vetting procedures required under paragraph (2) or the monitoring required under paragraph (3)(C) shall be reimbursed by the government of the country of which the alien being vetted or monitored is a national. The tuition payments charged by the Department of Defense or the Department of State to foreign countries for the education and training of their nationals may be appropriately adjusted to account for such costs. . (b) Transition period (1) In general The admissions requirements described in section 214(s) of the Immigration and Nationality Act, as added by subsection (a), including the requirement for military training visas and the continuous monitoring of the visa holder’s social media, personal associations, and travel, shall be applied retroactively for all foreign military students participating in a military training program in the United States as of the date of the enactment of this Act. All of the vetting procedures described in section 214(s)(2) of such Act shall be completed not later than 120 days after the date of the enactment of this Act. (2) Exception The retroactive admissions requirements referred to in paragraph (1) shall not apply to— (A) aliens who are nationals of any country that is a member of the North Atlantic Treaty Organization; (B) aliens who are nationals of Israel