Elwood A. Lloyd, a retired Army colonel whose specialties included ballistic missile defense, chemistry, biological warfare and radiological defense, died Feb. 14 at his family’s home in Canton, Conn. He was 85.

The cause was cardiac arrest and lymphoma, said his daughter, the Rev. Jeanne Lloyd.

Col. Lloyd retired from the Army in 1975 after serving at the Pentagon as deputy director of site defense and terminal systems office of the Safeguard Ballistic Missile Defense Program.

After retiring from the Army, he was a senior engineer with TRW Inc., a project manager for the federal Energy Research and Development Administration, and a vice president at Hydrocarbon Research Inc. He also did consulting. In 1995, he moved from to Canton from Springfield, Va.

Elwood Alon Lloyd was a native of Knoxville, Tenn., and a 1949 graduate of the University of Tennessee. He joined he Army during the Korean War. In 1961, he received a master’s degree in nuclear chemistry from the University of Tennessee.

His decorations included two awards each of the Legion of Merit and the Army Commendation Medal.

His wife of 54 years, Wynn Leach Lloyd, died in 2006. Survivors include a daughter, the Rev. Jeanne Lloyd of Canton, Conn.; a sister; and a grandson.

— Bart Barnes