James N. Juliana, who held a variety of federal positions as a Senate investigator and a top official of the Civil Aeronautics Board and Defense Department, died Nov. 18 at a hospital in Somers Point, N.J. He was 91.

The cause was cardiac arrest, his son Richard Juliana said.

Mr. Juliana began his career as a special agent with the FBI from 1947 to 1953. He then served for five years as a top investigator with the Senate Investigations Subcommittee looking into Communist activity in the government, led by Sen. Joseph R. McCarthy (R-Wis.) and his chief counsel, Roy Cohn.

Mr. Juliana was executive director of the Civil Aeronautics Board from 1958 to 1961, then led his own consulting company in Washington. After working as a consultant to Braniff International Airways, he served as a Braniff vice president from 1977 to 1981.

Mr. Juliana was also an executive vice president of the Armed Forces Marketing Council, which represents companies providing material to the military, from 1974 to 1981.

From 1981 to 1984, he was principal deputy assistant secretary of defense for manpower, reserve affairs and logistics under Defense Secretary Caspar W. Weinberger.

According to his son, Mr. Juliana was president of the Coalition of Military Distributors from 1991 until his death.

James Nicholas Juliana was born in Camden, N.J., and was a 1944 graduate of Washington College in Chestertown, Md. He was a Navy veteran of World War II, serving in the Pacific theater.

He lived in Rockville for many years and was a member of Holy Redeemer Catholic Church in Kensington. He was a member of many fraternal and professional organizations and served as director of the Washington chapter of the Catholic Youth Organization. He settled permanently in Ocean City, N.J., in 2004.

His wife of 58 years, Bette Sutton Juliana, died in 2006. A son, Ronald Juliana, died in 1960.

Survivors include seven children, James S. Juliana of Littleton, Colo., Patrick Juliana of Fort Collins, Colo., Lisa DiStefano of Ocean City, Thomas Juliana of Harrisonburg, Va., David Juliana of Woodbine, N.J., Richard Juliana of West Chester, Pa., and Robert Juliana of Media, Pa.; a brother; nine grandchildren; and three great-grandchildren.

— Matt Schudel