Vietnam War HasClaimed Lives of Th ree More lowansBy THE ASSOCIATED PRESS Three Iowa servicemen were added Monday to the rising number of Americans killed in the Vietnam war.Latest reported death, though not as a result of hostile fire,was that of Army Maj. Tom Pollard, 31, of Red Oak. His parents, Mr. and Mrs. Claude Pollard, were told their son died Monday afternoon at a hospital in South Vietnam.Officials reported that Pollard, whose wife lives in Catania, Ga., was injured earlier in the day when a bomb from a U. S. warplane fell short of its target and crashed into a U. S. Army headquarters near Phu Bai, in the northermost tactical zone near Hue, the old Imperial City.Maj. Pollard was a 1959 graduate of the University of Iowaand had been in the Army since1960.Earlier, the Defense Department released the names of two more lowans killed in Vietnam fighting.They were Army Spec. 4 Terry R. Zimmerman, 19, the husband of Claudie L. Zimmerman of Des Moines, and Army Pfc. Kurt P. Stephenson, the son of Mr. and Mrs. Robert G. Stephenson of Cedar Rapids. Stephenson had previously'been listed as missing in action. Zimmerman, the son of Mrs. William Thomas of Des Moines and William Zimmerman of Prior Lake, Minn., was reported killed last Friday near the demilitarized zone.Born in Chariton, Zimmerman entered the service in May, 1967, and had been in the combat zone since last October.