The report also said there were no credible claims of civilian casualties in Libya.

Such discrepancies are not exclusive to the Trump administration. During both Barack Obama’s and George W. Bush’s presidencies, accounts of strikes from American and nongovernmental organization sources were so at odds that they often seemed to be describing different events.

A 2016 executive order signed by Mr. Obama, and later enshrined by Congress, mandated that the Defense Department give an annual accounting of the number of civilians killed in American counterterrorism strikes around the world. Human rights groups criticized the Trump administration when the May 1 deadline for the first report came and went.

After its release, the report was also condemned by organizations that track civilian casualties.

“The Defense Department has deemed that the vast majority of claims of civilian casualties are not credible without ever investigating them,” Daphne Eviatar, a director with Amnesty International USA, said in an email. “Its numbers therefore likely severely undercount the actual civilian death toll.”

She called on the government to “meaningfully investigate all claims of civilian casualties and to be transparent about who is killed and harmed in U.S. military operations.”

In August, 10 civilians, including three children, were killed in a raid by foreign and Somali forces on a farm in southern Somalia, a deputy governor told reporters. At the time, the United States military confirmed that it had supported a counterterrorism operation in the area, and said it would look into the allegations. The report released on Friday does not mention the episode.