"Theodore E. Chandler" parted company with the carrier on 12 June and joined the destroyer for an 11-day assignment with Operation Sea Dragon. The two destroyers moved in close to shore and patrolled the Vietnamese coastline in an effort to interdict enemy waterborne logistics. Working in conjunction with Navy spotter aircraft, they ferreted out enemy cargo barges and sank them with gunfire. On two occasions during the assignment, "Theodore E. Chandler" came under fire from hostile shore batteries but managed to avoid any hits. The other half of Operation "Sea Dragon" consisted of shore bombardments to destroy depots and marshalling areas as well as to interdict coastal lines of communication. "Theodore E. Chandler" helped to destroy a number of buildings and to silence several North Vietnamese shore batteries that responded to the ships' barrage. On 23 June, her "Sea Dragon" relief arrived and, after two days of operations with the carrier , the warship arrived on 29 June in Yokosuka.