You can travel outside the U.S. for a maximum of 30 consecutive days at a time. Before each departure, you will have to notify the sponsor of your travel dates by sending them an email. Please note that you must imperatively have your DS-2019 with you during all your international travels as well as a travel authorization issued by the sponsor.
Your training program must take place on U.S. territory. Travels outside the U.S. must be limited in time and frequency.
Furthermore, you must always verify the validity of your visa in order to reenter the U.S.
You cannot travel outside the United States during your two grace periods before and after your DS-2019 dates. Should you do so, you might not be able to reenter the U.S.