Army Col. Robert R. Mondok, 44, director of resource management at the Army's Criminal Investigative Command in Falls Church, died of cancer Monday at Walter Reed Army Medical Center.

Col. Mondok received the Legion of Merit for his work with the Criminal Investigative Command, where he had been assigned since 1978. Before that, he had served as assistant comptroller at the Army's Intelligence Security Command at Arlington Hall.

He began his military career in 1957, after earning a master's degree in business administration from the university of Pittsburgh. He was a former air defense officer at Fort Bliss, Tex., and served in a number of Army staff and command positions in this country and n Okinawa and Vietnam.

An Arlington resident since 1971, Col. Mondok was born in Sharon, Pa. He graduated from Youngstown State University in Ohio and was a 1977 graduate of the Army War College.

Besides the Legion of Merit, his military awards include the Bronze Star Medal, the Meritorious Service Medal with oak leaf cluster and the Republic of Vietnam Gallantry Cross with Palm.

Survivors include his wife, Geraldine Ruth, and two sons, Robert M. and Christopher, all of Arlington; his parents, Rudolph and Sophie Mondok of Brookfield, Ohio, and two brothers, Fred of Youngstown, Ohio, and David W. of West Middlesex, Pa.