MACDILL AIR FORCE BASE, Fla. — Defense Secretary Ashton B. Carter said Thursday that the United States has asked more countries to send Special Operations troops to join the fight against the Islamic State, and not just typical partners like Britain and Australia.

Carter did not name the countries, but said “there are states in the region” who have been asked to become more active in the military campaign. Countries in the region that have Special Operations troops that train with U.S. forces include Jordan, the United Arab Emirates and Saudi Arabia.