Dr. Donald H. Sunde, 65, an electrical engineer who was an official of the Naval Air Systems Command and a retired captain in the Navy Reserves, died of cardiovascular disease June 11 at Arlington Hospital. He lived in McLean.

Dr. Sunde worked for the Bureau of Naval Ordnance and the weapons systems evaluation group of the Joint Chiefs of Staff between 1946 to 1954. He spent the next 10 years as an operations analyst at Air Force headquarters.

From 1964 until retiring in 1972, he was a technical director with the Naval Weapons Systems Analysis Office of the Naval Air Systems Command. He also was a consultant to the National Security Council during part of the Nixon administration. He was a 1972 recipient of the Navy's Superior Civilian Service Award.

Dr. Sunde was a native of Minnesota. He graduated from the Illinois Institute of Technology, earned a master's degree in mathematics at American University and a doctorate at Harvard University. He served on active duty in the Navy during World War II and retired from the Reserves in the mid-1970s.

He was a member of the Mt. Olivet United Methodist Church in Arlington.

Survivors include his wife, Shirley, of McLean; his mother, Gladys Sunde, of Owatonna, Minn., and a brother, Sewell, of Louisville, Ky.