An international student on an F-1 visa must obtain authorization through International Student Services (ISS) to complete the field training component of the MPH Program. Ask your faculty advisor to submit a recommendation letter to ISS to apply for this authorization immediately after your field training site has been finalized. Ask your faculty advisor to submit a recommendation letter to ISSS to apply for this authorization immediately after your field training site has been finalized. View sample academic advisor recommendation letter. Please refer to Curricular Practical Training (CPT) for more information.