Mr. Resor, a decorated Army veteran of World War II, was a corporate lawyer in New York and registered Republican when he joined the Johnson administration in 1965. He was recruited by his former Yale classmate, Cyrus Vance, who was serving as deputy defense secretary.
By the time Mr. Resor resigned in 1971, he had been the longest-serving Army secretary since the civilian position was created in 1947.
President Lyndon B. Johnson named Mr. Resor under-secretary of the Army in March 1965 and promoted him to secretary the following July. He inherited a military branch in the midst of a rapid escalation of forces in Vietnam. As Army secretary, Mr. Resor had overall responsibility for the soldiers’ welfare and handled administrative issues related to managing the growing force.
It was a tumultuous time for the Army. Drug abuse, racial discrimination and low morale seeped through the ranks, according to news accounts.
Mr. Resor was known for his quiet efficiency while dealing with such problems. He rarely gave interviews to the press and, according to the New York Times, held only two news conferences.
He was compelled to speak out in 1969 after a group of Army Special Forces soldiers were charged with murder and conspiracy in Vietnam.
The case involved Thai Khac Chuyen, a Vietnamese man who worked on top-secret missions with the Green Berets and the CIA, according to Time magazine. Once the soldiers discovered Chuyen was a double agent and aiding the enemy, he was drugged, interrogated and then shot to death. His weighted body was dumped into the South China Sea and never recovered.
Mr. Resor had approved putting the soldiers on trial but, according to the New York Times, was pressured to dismiss the charges against them at the behest of President Richard M. Nixon and CIA officials.
A few months later, Mr. Resor was called to testify on Capitol Hill after reports surfaced that an Army unit had killed unarmed civilians in the hamlet of My Lai on March 16, 1968.
On the orders of Army 1st Lt. William Calley — he told his men to “waste ’em” — American soldiers killed 109 unarmed civilians. Huts were torched to the ground. Many of the dead were peasant women and their babies.
Mr. Resor told lawmakers that the truth about what had happened at My Lai took more than a year to reach his desk. In the aftermath, Mr. Resor appointed Lt. Gen. William Peers to investigate the massacre. It was later revealed that Army officers had attempted to cover up the killings.
Seymour Hersh, the journalist who won the Pulitzer Prize in 1970 for breaking the My Lai story, said in an interview that Mr. Resor “did the right thing.”
“Give the Army credit — they did a better job than the national press corps and were already investigating the massacre,” Hersh said. “He did a very honorable job, but it was a terrible stain on the Army.”