Harry A. (Dutch) Noone, 50, a retired D.C. detective sergeant in the bank robbery squad who taught and lectured on bank security and who later operated a small fishing business on Chesapeake Bay, died of cancer Thursday at Calvert Memorial Hospital in Prince Frederick, Md.

Born and reared in Landover, Mr. Noone graduated from Bladensburg Senior High School. He lived in Landover before moving to Fairhaven, Md., about 10 years ago.

After serving in the U.S. Coast Guard for four years, he joined the D.C. police force in 1951 as an officer assigned to the old 14th precinct. In 1958, he was promoted to detective and subsequently assigned to the robbery squad. He then was assigned to the bank robbery squad, after its establishement in 1968. He was promoted to detective sergeant in 1972 and retired the following year.

A police department authority on bank security, Mr. Noone had traveled to several large cities around the country to study bank security measures. He frequently lectured on the subject and was instrumental in setting up security measures at Washington banks. He also taught a course on bank robberies at the D.C. Police Academy.

Mr. Noone worked as a carpenter for a short time after retiring. He then operated a small fishing and crabbing business on Chesapeake Bay until retiring a second time last year for reasons of health.

He was a member of the Upper Marlboro chapter of the Fraternal Order of Police, the D.C. Policemen's Association, the American Legion and the Veterans of Foreign Wars. He also was a member of St. Anthony's Catholic Church in North Beach, Md.

Survivors include his wife, Josephine, of Fairhaven; four sons, James F., of Annapolis, Harry A. Jr., of Montgomery County, and Brett and John, and two daughters, Catherine and Colleen, all of Fairhaven; four sisters, Mary Farr of Landover, Eleanor Johnson of Cape Windsor, Del., Louise Bresnahan of Miami, and Alice Rep of Upper Marlbobo; three brothers, Thomas B., of Hyattsville, and Robert J. and Frederick M., both of Landover, and two granddaughers.

The family suggests that expressions of sympathy be in the form of contributions to St. Anthony's Catholic Church, North Beach, Md., 20831.