Clayton M. Opp, 79, a retired Coast Guard captain and former defense industry marketing executive who was active in volunteer work, died Aug. 1 at his home in Falls Church after a heart attack. He had lived in this area since 1959.

Capt. Opp was born in Appleton, Minn., and grew up in Yakima, Wash. After graduating from the U.S. Coast Guard Academy in 1935, he did graduate work in chemistry and physics at the University of Chicago before returning to the Academy as an instructor.

During World War II, he served aboard a patrol frigate in the Southwest Pacific. After the war, he received a master's degree in business administration at Harvard University and commanded a cutter in Hawaii. Later posts included those of supply division chief at Coast Guard headquarters here. His last assignment, before retiring from active duty in 1957, was as commanding officer of the Coast Guard Supply Center in Brooklyn, N.Y.

After retirement from the service, he held several executive posts dealing with government marketing. He worked for several companies, including International Telephone & Telegraph and Litton Industries. From 1968 to 1972, he worked for the Kaman Aerospace Corp. here, retiring as vice president for Washington operations. He then was a consultant until the late 1980s.

Capt. Opp, as a volunteer, recorded more than 100 books for the Recording Service for the Visually Handicapped. He had served on the Falls Church-based organization's board of directors and had served on the national board and the finance committee of the Retired Officers Association.

He was a member of the Protestant congregation of Fort Myer Chapel and had served on its parish council.

Survivors include his wife of 53 years, Helen F. Opp, of Falls Church; two daughters, Karen O. LaBarr of Atlanta, and Janet E. McPherson of Omaha; a brother, Alfred P., of Anchorage; a sister, Helen Polenske of Yakima; and three grandchildren.

ROBERT R. WALLACH

Bank Vice President

Robert Robbins Wallach, 74, a retired vice president of the American Security Bank in Washington, died Aug. 4 at Fauquier Hospital in Warrenton. He had emphysema.

Mr. Wallach, who lived at Hopefield, his farm near Warrenton, was born in Washington. He graduated from the Stuyvesant School in Warrenton and the University of Virginia. He then returned to Washington and went to work for the National Savings and Trust Co.

During World War II, he served in the Army in Europe. He was assigned to the military government of West Germany after the war. He later lived in Switzerland and France.

In 1956, he came back to this country and joined American Security Bank. He was vice president in charge of foreign operations when he retired about 1980.

Survivors include his wife, the former Erica Glaser, of Warrenton; two children, Madeleine Kulski of Orlean, Va., and Robert S. Wallach of Burke; a sister, Hope Wallach Porter of Warrenton; a brother, Marshall Wallach of Warrenton; and two grandchildren.

DR. CONRAD L. GOSSELS

Physician

Dr. Conrad L. Gossels, 82, a retired physician who had offices in Arlington and Washington, died of renal failure Aug. 3 at Sibley Memorial Hospital.

Dr. Gossels, a resident of Washington, was born in Berlin, Germany. He received his medical education at the universities of Berlin and Innsbruck. He came to this country in 1941 and lived in Mount Jackson, Va., until moving to the Washington area in 1949.

He opened a general practice of medicine and continued it until retiring in 1981. He was a staff physician at George Washington University Hospital and a member of the Virginia and D.C. Medical societies.

His first wife, Miriam Gossels, died in 1971.

Survivors include his wife, Natalie Gossels of Washington; two stepchildren, Carol Tannenwald of Washington and Susan Gluck of Los Altos, Calif.; and three stepgrandchildren.