Allen I. O'Brien, 62, a retired deputy chief of the mid-Atlantic region of the Federal Protective Service who was active in veterans' organizations, died of a heart ailment June 29 at his home in Silver Spring.

Mr. O'Brien was born in Baltimore, where he worked for the old Federal Land Bank before enlisting in the Army in October 1941. He served as an officer in the 3rd Army in Europe during the war.

He moved to this area in 1952, working first for the Veterans' Administration and then for the General Services Administration. He became a regional deputy chief of the GSA's Federal Protective Service before retiring in 1970.

Mr. O'Brien had been a life member and cammander of Cissel-Saxon Post 41 of the American Legion in Silver Spring. He also had been active in the Veterans' Administrative Voluntary Services (VAVS), an organization that helped raise funds for Veterans Administration hospitals.

He also belonged to the Veterans of Foreign Wars Post No. 2562 in Silver Spring, and Chapter No. 4 of the Disabled American Veterans.

He is survived by his wife, Jeannette, of the home; a son, James R. of Baltimore; a stepson, James Albright, of Garden Grove, Calif; a stepdaughter, Judy Davis, of Clinton, Md.; two sisters, Genevieve Perino, of Silver Spring, and Ann Kircher, of Balitimore, and six grandchildren.

The family suggests theat expressions of sympathy be in the form of contributions to the VAVS O'Brien Memorial, c/o Cissel-Saxon Post of the American Legion, 905 Sligo Ave., Silver Spring.