150322-N-ZZ999-020 ATLANTIC OCEAN Commanding Officer of the Nimitz-class aircraft carrier USS Theodore Roosevelt Capt. Daniel Grieco, left, receives a token of appreciation from the United Kingdom Secretary of State for Defence Michael Fallon aboard Theodore Roosevelt March 22, 2015. Theodore Roosevelt, homeported in Norfok, is conducting naval operations in the U.S. 6th Fleet area of operations in support of U.S. national security interests in Europe.