"Niagara Flass" returned to Vietnam in 1972, continued its replenishment cycle of one weekend in port (normally US Naval Base Subic Bay, Philippines) and two weeks "on line," throughout later 1972 and into early 1973. Normal routine included resupplying the destroyers on the and continuing up to Yankee Station to replenish the aircraft carriers, including and . Following the cease fire, "Niagara Falls" supported Operation End Sweep to clear Haiphong harbor of the mines that were dropped by naval aircraft. Captain E.B. McDaniel served as Commanding Officer from June 1975 to September 1976.