Five of the officials said there have been at least 22 military fatalities — four more than what appears in the Pentagon’s public database, known as the Defense Casualty Analysis System, or DCAS.

A sixth official, who like the others spoke on the condition of anonymity to discuss the figures, said 23 service members have died since Feb. 28, when the Trump administration, in concert with Israel, initiated the Iran war. Not all of the undisclosed deaths are directly tied to the conflict but have involved U.S. personnel who were in the Middle East amid ongoing hostilities, this person said.