U.S. Navy Petty Officer 2nd Class Jose Alvarez inspects fuel samples for bottom sediment and water in the oil lab aboard the guided-missile destroyer USS Preble after refueling at sea with the Military Sealift Command fleet replenishment oiler USNS Yukon to support Talisman Saber 2013, an exercise in the Coral Sea, July 27, 2013. The biennial training exercise aims to improve Australian and U.S. combat readiness and interoperability.