Pentagon Press Secretary Peter Cook provided the following readout:

Secretary of Defense Ash Carter spoke today by telephone with his counterpart from the United Kingdom, State Secretary for Defense Michael Fallon. Secretary Carter emphasized that the United States and the United Kingdom will always enjoy a special relationship, one reflected in our close defense ties, which remain a bedrock of U.S. security and foreign policy. He reaffirmed that those bonds endure after yesterday's vote by the United Kingdom to exit the European Union. He also emphasized the United States' unshakeable commitment to NATO, of which the United Kingdom is a vital member, and to the vision we share with our allies in the United Kingdom and other European nations. Secretary Carter welcomed Minister Fallon's commitment to continuing the United Kingdom's active and enduring role in global security issues, in particular its work within NATO and efforts to accelerate the lasting defeat of ISIL. The two leaders committed to work together to strengthen international partnerships that have helped ensure security for the United States, the United Kingdom, Europe and the world.