Retired Army Co. Mary Lipscomb Hamrick, 57, who was chief of Army Medical Specialists Corps from 1966 until her retirement in 1969, died of cardiac arrest Tuesday at her home in McLean.

A dietitian, she had spent much of her 26 years in the Army at hospitals in this county and abroad. She came here in 1964 as assistant chief of the AMSC and chief of the dietitian section in the Office of the Army Surgeon General.

Col. Hamrick was born in Clio, S.C. after earning a degree in home economics from Winthrop College in Rock Hill, S. C., she was an apprentdietitian at several hospitals.

She was commissioned as an Army Hospital dietitian in 1943 and served aboard a hospital ship during World War II. During the Korean conflict, she was a dietitian at the Tokyo Army Hospital in Japan.

Col. Hamrick then earned a master's degree from Iowa State College and a doctorate from the University of Wisconsin. She had a supervisory position at Brooke General Hospital in San Antonio, Tex., and was an AMSC procurement officer based with the 5th Army in Chicago.

Her decorations included the Distinguished Service Medal. She was a member of the American Dietetic Association and the Association of Military Surgeons of the U.S..

She is survived by her husband, retired Army Brig. Gen. William A. Hamrick, of the home; three step-children, James and William Hamrick Jr., both of Houston, and Donna Glenn, of San Antonio; a brother, Lafar Lipscomb, of Baton Rouge, La.; a sister, Rebecca Allen, of Dillon, S.C., and six stepgrandchildren.

The family suggests that expressions of sympathy be in the form of contributions to the Mary Lipscomb Hamrick Memorial Scholrship Fund in care of the American Dietetic Association in Chicago. CAPTION: Picture, MARY L. HAMRICK