Trevor Nevitt Dupuy, 79, a retired Army colonel who wrote prolifically about military affairs and was a specialist in the field of combat casualty predictions, died June 5 of a self-inflicted gunshot wound in a parking lot near Vienna Elementary School. A spokeswoman for the Vienna police said his death was a suicide.

Col. Dupuy, a resident of Vienna, had cancer, his family said. He had lived in the Washington area off and on since the mid-1940s.

He wrote more than 90 books, some of which are required reading at the U.S. Military Academy at West Point. His works include "Hitler's Last Gamble," a study of the Battle of the Bulge published last year, "The Compact History of the Civil War," "Elusive Victory: The Arab-Israeli Wars 1947-74" and a multi-volume series on the military history of World War I and World War II. Earlier, he collaborated with his father, Army Col. R. Ernest Dupuy, on "The Encyclopedia of Military History" and other military books.

In recent years, Col. Dupuy headed organizations that assisted clients in military research and defense analysis. He was born in New York and was a West Point graduate. He served in Burma during World War II, attaining the rank of lieutenant colonel by age 27. His decorations included the Legion of Merit and Bronze Star.

Col. Dupuy served at the Pentagon and in Europe after the war and taught military science at Harvard University. He also was director of the military history program at Ohio State University. After he retired in 1958, he established a graduate school of international relations at Rangoon University in Burma.

In the mid-1970s, he began to develop a methodology for forecasting battlefield attrition and materiel losses. It evolved into a computer model used to plot possible outcomes of armed conflict, and Col. Dupuy drew on this model to predict a short duration for the Gulf War. He testified to that effect before Congress.

Col. Dupuy's marriages to Jean McVicar, Helen Castle and Christine Geissbuhler ended in divorce. His fourth wife, Jonna Bjerggaard, died in 1982.

Survivors include his wife, Zhang Yun Dupuy of Vienna; three children from his first marriage, Trevor Dupuy of San Antonio, Ernest Dupuy of Morris Township, N.J., and George Dupuy of LaGrange, Ga.; a daughter from his second marriage, Laura Dupuy of Lynchburg, Va.; four children from his third marriage, Charles Dupuy of Princeton, N.J., Mirande Dupuy of New York, Arnold Dupuy of Falls Church and Fielding Dupuy of New York; and a daughter from his fourth marriage, Signe Dupuy of Falls Church; and nine grandchildren. M. MARGARET BARLOW Disabilities Program Manager

M. Margaret Barlow, 63, disabilities program manager of the General Accounting Office and executive director of the National Task Force on Disability, died of respiratory and renal failure June 6 at George Washington University Hospital. She was a resident of Arlington and had lived in the Washington area since 1978.

Dr. Barlow, one of four siblings who were born blind, was an activist on behalf of people with disabilities. The task force she headed worked with the federal government and private sector on disability issues. Before joining the GAO five years ago, she was a freelance writer, researcher and consultant. She also had been a special education elementary school teacher for 10 years in Fairview Park, Ohio.

Dr. Barlow was born in Dunmore, W.Va., and raised in Marlinton, W.Va. She was a graduate of Marshall University and received a master's degree in education from Syracuse University and a doctorate in human development from George Washington University.

She was a member of the Council for Exceptional Children, Phi Delta Kappa and Mensa and attended Langley Hill Friends Meeting.

Survivors include a brother, Sammie Barlow of Buckeye, W.Va. RICHARD C. LEWIS JR. Law Student

Richard C. Lewis Jr., 36, a law student at George Washington University, died of cancer June 5 at his home in Washington. He had lived in Washington for 12 years.

Mr. Lewis was born in Philadelphia and raised in Guilford, Conn. He was a graduate of Oberlin College and received a master's degree in Soviet studies from Georgetown University. He also studied at the University of Leningrad and interned in courts in Moscow during the summer of 1993 on a fellowship from the American Bar Association.

Mr. Lewis worked for four years as a research associate at the U.S. Institute of Peace in Washington. He participated as a student in the Immigration Legal Clinic and Domestic Violence Legal Clinic at GWU and was a teaching assistant in the legal writing program.

He received the Michael D. Cooley Memorial Award of George Washington University for being a model student.

Survivors include his companion, Elizabeth K. Ross of Washington; his parents, Jane White-Lewis and Dr. Richard C. Lewis Sr., both of Guilford; two brothers, Mark W. Lewis of Washington and Ian B. Lewis of Portland, Ore.; and his grandmother, Jane S. White of Cincinnati. ALBERT J. AARONIANVA Hospital Dental Chief

Albert J. Aaronian, 78, who retired in 1985 as chief of the dental service at the Washington Veterans Affairs Hospital, died of a heart attack May 31 at his home in Bethesda.

Dr. Aaronian was assistant chief medical director for dentistry of the Veterans Administration, now the Department of Veterans Affairs, from 1972 to 1982. He then joined the hospital. He was also an associate clinical professor at the Georgetown University school of dentistry for 30 years.

Dr. Aaronian was a native of Aptonaug, R.I., and a graduate of Providence College. He graduated cum laude from Georgetown University dentistry school. He practiced in Boston before returning to Washington in the late 1950s.

He was a member of the Georgetown University Alumni Association, the American Dental Association and its Council on Education, the International College of Dentists and the American College of Dentistry.

His first wife, Donna B. Aaronian, died in 1979. Survivors include his wife, Carolyn J. Aaronian of Bethesda, and a sister, Rena Jorjorian of Providence, R.I. Edward James Wilt II CIA Officer

Edward James Wilt II, 64, a retired Central Intelligence Agency officer, died of bone cancer June 7 at the Hospice of Washington.

Mr. Wilt, a resident of Washington since 1961, was born in Eustis, Fla. He was a graduate of the University of Michigan and served in the Army during the Korean War.

He went to work for the CIA in 1955 and was posted to Iran, England and Italy. After retiring from the agency in 1977, he was a business consultant.

Survivors include his wife, Mary Anne Wilt of Washington; two sons, Adam Wilt of Menlo Park, Calif., and Justin Wilt of Arlington; and a sister, Ann McAleenan of Mount Dora, Fla. MABLE MARIE SWEENEY SMITH Payroll Accounting Clerk

Mable Marie Sweeney Smith, 95, a payroll accounting clerk who retired in 1964 after 30 years with the Justice Department, died of congestive heart failure June 6 at the Knollwood retirement home in Washington.

Mrs. Smith was born in Neihart, Mont. She attended the University of Idaho.

She was a member of the Sodality and the Second and Fourth Monday Club at the Shrine of the Most Blessed Sacrament in Washington, Kappa Kappa Gamma social sorority and the Idaho State Society.

Her husband, Walter S. Smith, died in 1970. Survivors include three children, Benjamin J. Smith of Scottsdale, Ariz., Martha S. Whalen of Rockville and Patricia S. Daley of Arlington; 14 grandchildren; and 28 great-grandchildren. JOHN DANIEL O'NEALE National Park Service Engineer

John Daniel O'Neale, 59, a Washington native and retired National Park Service engineer, was killed May 21 in an auto accident near Orienta, Okla. He was a resident of Anchorage.

The Oklahoma Highway Patrol said that Mr. O'Neale's motor home collided with a tractor-trailer on Route 412 in Major County. Both drivers were pronounced dead at the scene.

Mr. O'Neale, who was known as Jack, was a graduate of Gonzaga College High School and George Washington University. He was an engineer for Atlantic Research Corp. before moving away from the Washington area in 1969. He was a design and construction engineer at Yellowstone, Grand Canyon, Yosemite and other national parks. His last assignment was at Denali National Park in Alaska. He retired last year.

Mr. O'Neale was a member of the Audubon Society.

Survivors include his wife, Judith O'Neale, of Anchorage; a brother, Hugh W. O'Neale of Midway, Ark., and a sister, Eleanor O'Neale Markham of Naples, Fla. CARL A. PHILLIPPS Lawyer, Federal Tax Specialist

Carl A. Phillipps, 89, a retired lawyer who specialized in tax law, died of congestive heart failure June 5 at Shady Grove Adventist Nursing Center.

Mr. Phillipps was a native Washingtonian and a graduate of Central High School. He received a bachelor's degree in foreign service from Georgetown University and a law degree from American University.

Early in his career, Mr. Phillipps was a senatorial aide and an attorney for the Joint Congressional Committee on Internal Revenue. He later was an attorney for the IRS and assistant general counsel of the Lehigh Valley Railroad.

In 1946, he co-founded the Garrity & Phillipps law firm in Washington and in 1962 established a private law practice in Bethesda. He retired last year.

Mr. Phillipps was president of the University Club and a member of Columbia Country Club and St. Raphael's Catholic Church in Rockville.

Survivors include his wife of 55 years, Doris Goss Phillipps of Gaithersburg, two children, Carl Goss Phillipps of Venice, Fla., and Linda Phillipps Harley of Westlake Village, Calif.; seven grandchildren; and two great-grandchildren.