 Complete the following phrase:  It returned to Subic Bay on 14 January and resumed training operations punctuated by visits to Singapore, Hong Kong and Kobe, Japan. It began operations in Vietnamese waters at the beginning of April, operating on Yankee Station to provide search-and-rescue and medical evacuation services. It departed the combat zone twice, once for upkeep at Subic Bay and later to exchange battalion landing teams at Okinawa. At the end of June, it resumed flight operations in connection with troop movements. However, instead of carrying embarked Marines inland for amphibious landings, its helicopters moved South Vietnamese troops from point to point ashore. On 29 June, Tripoli-assigned helicopters helped to transport 1,400 Vietnamese Marines from Tam My to the vicinity of Quang Tri City during the 