“I don’t know what we’ll discover with respect to what was going on in Centcom,” Mr. Obama said. “What I do know is my expectation — which is the highest fidelity to facts, data, the truth.”

Mr. Obama was responding to a report in The New York Times on Sunday that described the internal Pentagon investigation. Some analysts in the Defense Department say their supervisors revised their conclusions about some of the military’s failures before making the reports final.