Frederic T. Parker, 83, a retired construction official with the National Security Agency and colonel in the Army Corps of Engineers, died of cardiac arrest Oct. 10 at Arlington Hospital. He lived in Arlington.

In World War I, Col. Parker was a lieutenant in the artillery. In the 1930s, he commanded Civilian Conservation Corps camps in the South. In 1940, he went on active duty with the Corps of Engineers and during World War II served at various posts in this country and the West Indies.

In 1950, he went to work as a civilian in the Office of the Chief of Engineers. He was a construction management engineeer for the Military District of Washington until 1953. He then joined NSA, where he did similar work until retiring in 1953. He retired from the Army Reserves in 1957.

Col. Parker, who was born in Rock Rapids, Iowa, was graduated from Grinnell College and the Harvard University business school.

He was a member of the Military Order of World Wars, the Reserve Officers Association and other service-connected groups.

He was a deputy governor of the Society of the Mayflower Descendents here and a member of the Sons of the American Revolution and the Unitarian Church of Arlington.

Survivors include his wife, the former Lois Goodfellow, of Arlington; two sons, Frederic G. and James R., both of Alexandria, and a grandson.