Retired Air Force Col. Lewis Rex Long, 71, an intelligence officer, died of cancer Tuesday at Malcolm Grow Hospital at Andrews Air Force Base.

His last duty post had been at Clark Air Force Base in the Philippines where he was deputy chief of staff for intelligence of the 113th Air Force. He served there from 1960 to 1963.

Col. Long then was transferred to Travis Air Force Base in California where he retired in early 1964, when he moved to the Washington area. He lived in Arlington.

After returning here, he earned a master's degree in international affairs at George Washington University and worked as a civilian intelligence analyst at the National Security Agency at Fort Meade until retiring a second time in 1971.

Col. Long was born in Boulder, Colo., and graduated from the University of Denver. He entered the Army Air Corps in 1941.

After World War Ii, he was an intelligence officer with U.S. forces in Wiesbaden, Germany. He also had tours of duty with the Defense Intelligence Agency at the Pentagon in 1949-52 and 1956-60. He held the Legion of Merit.

He is survived by his wife Betty of Arlington; two daughters, Linda Holloway of Reston and Valerie Whitelock of Bowie; a son, Jerry Rex of Washington; his mother Tennie L. Long of Kingston, Tenn.: two sisters, Gay Long of Kingston and Rae Hall of Boulder and two grandchildren.

The family suggests that expressions of sympathy be in the form of contributions to the Arlington Chapter of the American Cancer Society.