From 28 January to 10 February, "Agerholm" served as escort for the destroyer leader in the positive identification radar advisory zone (PIRAZ). She then proceeded to the Southern SAR station to ride shotgun for the destroyer leader . The destroyer shifted to the gunline on 23 March, and provided naval gunfire support to troops in the Viet Cong-dominated Rung Sat Special Zone (RSSZ). Anchored in the shallow restricted water with the Viet Cong less than away, "Agerholm" was vulnerable to enemy fire, underwater swimmers, and mines. On 25 March, the destroyer first fired both RAP and conventional ammunition into the RSSZ with great accuracy. On 13 April, she retired from NGFS to visit Singapore, Hong Kong, and Kaohsiang. "Agerholm" returned to the gunline on 15 May, conducting shore bombardments off Phan Thiet until 23 May. She then reported to the cruiser on PIRAZ station in the Gulf of Tonkin for her last assignment. On 10 June, the warship was relieved and ordered to Subic Bay to prepare for her return voyage. After port visits to Brisbane, Australia, and Auckland, New Zealand "Agerholm" set a course for San Diego, where she arrived on 24 July.