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SEATTLE — The brutal, premeditated killings of three Afghan civilians — allegedly at the hands of American soldiers — are expected to be detailed in military court near here this fall, potentially undermining efforts by the United States as it tries to win support among Afghans in fighting the Taliban.

Emma and Christopher Winfield with a photograph of their son, Specialist Adam Winfield. Specialist Winfield is among soldiers accused in the deaths of Afghan civilians last winter.

The cases, which accuse five members of an Army Stryker brigade from Joint Base Lewis-McChord, near Tacoma, of deliberately ambushing three Afghan men with grenades and rifle fire this year, have also raised questions about how the Army has handled them.

The father of one of the soldiers said in an interview that he had repeatedly tried to alert military officials that his son had told him through Facebook in February that one murder had already been committed by members of his unit and that others could happen in the future.

The son had been threatened by members of his unit and feared for his life, said the father, Christopher Winfield, of Cape Coral, Fla. Two more people were killed after Mr. Winfield first reached out to the Army.

“Nobody listened,” he said.