"Benner" began 1968 with ASW refresher training out of San Diego and then deployed once more to Far Eastern waters. Arriving at Yokosuka on 29 May, she headed south to Vietnamese waters and duty as a naval gunfire support ship. Her first opportunity for action came on 26 June when she fired almost 900 5-inch rounds at Viet Cong troops in the Vũng Tàu area in support of "Operation Game Warden". Over the next three weeks, the destroyer also fired in the Demilitarized Zone (DMZ) and in I Corps territory.