Floyd B. T. Myhre, 73, a retired Navy captain who was decorated in in World War II and a former executive of an industrial security trade association, died Sunday at the Bethesda Naval Medical Center. He had pneumonia.

Capt. Myhre, who was born in Minneapolis, Minn., graduated from the U.S. Naval Academy at Annapolis in 1931. During World War II he earned a Silver Star Medal for leading a salvage party aboard a heavily damaged and burning American ship in the Pacific. He won a second Silver Star while serving as captain of the destroyer Buchanan in the Solomon Islands campaign. He later commanded the destroyer Cunningham at Okinawa and elsewhere.

In 1947, when he retired from the Navy because of a physical disability, he became vice president of the American International Insurance Co. in Havana, Cuba. Capt. Myhre had maintained his permanent residence in the Washington area since leaving the Naval Academy and in 1950 he returned here. For the next five years he was on the staff of the National Security Industrial Association, an association concerned with industrial security.

From 1955 until 1966, he worked for an insurance firm in Silver Spring. He then went back to the NSIA and retired from that organization in the early 1970s.

Capt. Myhre, who lived in Bethesda, was a member of the Chevy Chase Club, the Army & Navy Club, the New York Yacht Club, the American Legion, the Naval Academy Alumni Association and the Military. Order of the Carabao.

His first wife, the former Anne Jewell, died in 1965.

Survivors include his wife, the former Jeannette Edgerton of Bethesda; two children by his first marriage, Jon Floyd of Vero Beach, Fla., and Jan Brand of Gaithersburg, and four grandchildren.

The family suggests that expressions of sympathy be in the form of contributions to the Bethesda-Chevy Chase Rescue Squad, or to the Naval Academy Alumni Association.