The casualty figure has not been previously reported. Prior to Reuters’ publication of the figure, the Pentagon had only disclosed eight U.S. personnel seriously injured.

In a statement after ​Reuters published its report, the Pentagon estimated the figure to be approximately ​140 wounded and said the vast majority of them were ⁠minor.

“Since the start of Operation Epic Fury, approximately 140 U.S. service members ​have been wounded over 10 days of sustained attacks,” said chief Pentagon ​spokesperson Sean Parnell.

He said 108 of the wounded service members had already returned to duty.

Parnell said the eight seriously wounded service members were receiving the highest level of medical ​care.

Reuters could not determine the types of injuries and whether they include traumatic brain ​injuries, which are common after exposure to blasts.

Iran has launched retaliatory strikes against U.S. military bases ‌since ⁠the start of the conflict on February 28.

It has also struck diplomatic missions in Arab Gulf states, as well as hotels and airports and damaged oil infrastructure.

The Pentagon says the number of Iranian strikes has fallen sharply ​since the start of ​the war, as ⁠the U.S. military bombs Iran’s weapons inventories and targets Iran’s more limited number of missile launchers.

Asked if ​Iran was a stronger adversary than he expected when the ​U.S. military ⁠drew up its war plans, General Dan Caine, chairman of the Joint Chiefs of Staff, told reporters earlier on Tuesday that the fight was not harder than ⁠expected.

“I think ​they’re fighting, and I respect that, but ​I don’t think they are more formidable than what we thought,” Caine told a Pentagon briefing.