Steaming generally in pairs, the two to four American and Australian destroyers and one cruiser worked with carrier-based spotter planes, such as A-1 Skyraider and Grumman S-2 Tracker, to find, identify, and destroy infiltrating vessels and shore targets. Often, North Vietnamese coastal batteries fired back. Although several of the 19 ships that were hit required repairs at shipyards in Japan and the Philippines, no vessel was sunk during the two-year long Sea Dragon operation. Damaged ships were quickly replaced on the gun line and the coastal deployment was maintained. Periodically, this group reinforced the Seventh Fleet cruisers and destroyers providing naval gunfire support to allied forces in South Vietnam. The naval surface group conducted the Sea Dragon effort until the end of October 1968, when American combat operations in North Vietnam ceased.