Petty Officer 2nd Class Caleb Noble, from Huntington, W.Va., tests an unknown agent during a chemical, biological and radiological general quarters drill aboard the Nimitz-class aircraft carrier USS Harry S. Truman. The substance is a training tool provided by the Naval Medical Research Center. Harry S. Truman is deployed as part of the Harry S. Truman Carrier Strike Group supporting maritime security operations and theater security cooperation efforts in the U.S. 5th and 6th Fleet areas of responsibility.