Navy Lt. Ben Olivas prepares for an air defense exercise during an underway cruiser-destroyer, surface advanced tactical training exercise aboard the guided-missile destroyer USS Stockdale in the Pacific Ocean, April 23, 2018. Olivas is a surface warfare tactics instructor assigned to the Naval Surface and Mine Warfighting Development Center. Stockdale is one of three warships from the USS John C. Stennis Carrier Strike Group participating in the exercise that’s designed to increase warfighting proficiency, lethality and interoperability of participating units. Navy photo by Petty Officer 2nd Class Amanda A. Hayes