150331-N-GR120-058 ATLANTIC OCEAN – Sailors simulate emergency medical response and firefighting tactics during a mass casualty drill on the flight deck aboard the Nimitz-class aircraft carrier USS Theodore Roosevelt March 31, 2015. Theodore Roosevelt deployed from Norfolk and will execute a homeport shift to San Diego at the conclusion of deployment. Theodore Roosevelt is conducting naval operations in the U.S. 6th Fleet area of operations in support of U.S. national security interests in Europe.