Retired Air Force Col. Lycurgus E. Lines Jr., 50, a decorated vetern of the Vietnam conflict, died of leukemia Saturday at Fairfax Hospital.

An electronics warfare officer based in Thailand between 1969 and 1970, he earned the Distinguished Flying Cross, the Bronze Star, and the Air Medal with three oak leaf clusters.

Col. Lines served as an Air Force officer for 25 years before retiring in 1977. His other foreign assignments included Korea and Japan.

He spent most of his career after 1963 in Washington, serving first with the Air Force Data Service Center and then with the Defense Security Assistance Agency. He served with the Defense Supply Agnecy during his last two years.

Col. Lines worked about two years with the Honeywell Corporation as a systems analyst in McLean before retiring earlier this year. Over the years, he also had taught advanced computer science classes at Northern Virgina Community College, the Agriculture Department's graduate school and American University.

He was a native of Missouri, A graduate of the University of Arkansas, he also earned a master's degree in engineering at the University of Michigan.

Col. Lines was a member of Grace Presbyterian Church in Springfield and lived in Annandale.

Survivors include his wife, Betty L., a son, Lycurgus E. III, and two daughters, Jane B. and Lynne E., all of Annadale; another daughter, Anne K. Cuppersmith of Roanoke, and his parents, Mr. and Mrs. Lycurgus E. Lines Sr., and a sister, Doris Prohaska, all of Lodi, Calif.